I'm saying he'll get them to do neither.

Easy way for multi to provide an iota of evidence that what he's doing is effective: Find at least one person who says they canceled a cryo subscription and started sending an exactly corresponding amount of money to the Singularity Institute. If you just start sending an equal amount of money to the Singularity Institute, without canceling the cryo, then it doesn't count as evidence in his favor, of course; and that is just what I would recommend anyone feeling guilty actually do. And if anyone actually sends the money to Africa instead, I am entirely unimpressed, and I suggest that they go outside and look up at the night sky for a while and remember what this is actually about.