Start with the uncomfortable mechanics of what just happened. You explained, carefully and sincerely, that you have arranged to be preserved after you die. And the person across the table, someone you like, said: "That sounds like a scam. You are really going to fall for that?" The sting is real, because you are not gullible and you did think this through. But the useful move is not to feel insulted. It is to understand exactly what their brain just did, because once you see it, the whole conversation gets easier.
Here is the thing worth taking literally: "it is a scam" is almost never a considered position. It is a reflex. It is a pattern-matcher firing, and most of the time that matcher is doing you a favor.
The scam-detector is usually right, which is exactly the problem
Your friend's instinct evolved, socially and personally, to catch a specific shape: something that sounds too good to be true, plays on fear, asks for money, and promises an outcome that feels impossible. Cryopreservation trips every one of those wires at once. So the detector lights up. And in the median case, a thing that trips all four wires really is a scam, which is why the instinct is worth keeping.
The trouble is that legitimate but genuinely strange ideas trip the same wires. "Let me inject you with a piece of the disease so you do not get the disease" is not naturally compelling, and yet it is the entire basis of vaccination. Sitting inside a sealed metal tube that flings itself across an ocean sounded deranged right up until it became the most boring thing you can do on a Tuesday. A scam-detector that never produced a false positive would also reject every real advance that happened to look weird first. So when your friend's fires, they are not being foolish. They are running a good heuristic that simply misfires on this input. Knowing that lets you answer with patience instead of defending yourself like the accused.
Argue the structure, not the outcome
The losing move is to try to prove cryopreservation works. You cannot, and you should not pretend to, because revival is currently not possible and saying otherwise would be the actual dishonest pitch. The winning move is to separate two things your friend has glued together: "might not work" and "is a fraud." These are completely different claims.
A scam is when no real service is provided and the operator plans to vanish. Measure the thing against that definition out loud. Tomorrow.bio is a registered company, founded in 2020, with standby teams based in Berlin and Amsterdam and long-term storage handled by a separate non-profit, the European Biostasis Foundation, at a facility in Rafz, Switzerland, that you can physically visit. The procedures are published. People are already preserved. None of that proves it will succeed. All of it proves a real service exists, which is the entire content of the "scam" charge, now refuted.
Follow the incentives, because scams have a tell
If you want a sharper tool, point at the money, because the financial structure is the opposite of how fraud is built. A scam wants a large amount up front and a fast exit. Biostasis is funded the other way around: a modest monthly membership, alongside a life insurance policy that covers the one-time preservation cost and only pays out when you die, decades from now. The organization's survival depends on quietly keeping its promise for a very long time, which is an absurd amount of patience for a con and a sensible amount for an institution that means it. If you want the deeper version, the dedicated piece on whether this is a scam that exploits desperate people walks through the same logic, and the common false beliefs article clears the adjacent myths.
What you are actually defending is the bet, not the certainty
When you do explain your reasoning, keep it honest and small. You believe what makes you you is encoded in the physical structure of your brain, the subject of memory, identity and the brain. If that structure is preserved well enough, future medicine might restore function. The procedure replaces the blood with a cryoprotectant solution so the brain vitrifies, cooling into a glass-like solid rather than forming the ice crystals that would tear that structure apart, and if the preservation is good enough, future medicine might restore function. You are betting that medical capability keeps improving, which the last two centuries make a reasonable bet. You are not claiming it will work. You are claiming the possibility is worth keeping open, because a small chance is infinitely larger than no chance. That is the position you can defend forever, because it is the one you actually hold.
You do not owe anyone a conversion
Some people will keep calling it a scam no matter what you say, and that is allowed. You are not running an evangelism campaign; you are trying to be honest with someone you care about. If they are genuinely curious, explain. If they are dismissive, change the subject without resentment: "I get that it is not for everyone. How is work?" And listen for what "scam" is really standing in for, because often it is something else wearing that word, a worry that you are wasting money, or plain discomfort with talking about death. "What specifically seems scammy about it?" usually surfaces the real concern, which is the one you can actually address.
Then let it sit. First reactions are rarely final positions. You plant the reasoning, calmly, and walk away. A year later the same friend may say, "You know that cryonics thing? I have been thinking about what you said." That happens precisely because you did not push.
"It is a scam" is a good instinct misfiring on an unfamiliar input, so answer the instinct, not the insult.
The goal was never to win. It was to stay honest about your own choice while keeping the relationship intact, and those two things almost never actually conflict. Most people can respect a decision they would not make, once they see you made it with clear eyes. If the skeptic later wants the strongest version of the doubts, send them to our arguments against cryonics, because the fastest way to retire the word "scam" is to show that we argue against ourselves in print.