Alternatively, you can simply stop accepting new members (or shut down completely) if the donations dry up and you can’t afford to run your instance - or if you just don’t want to do it anymore. Other instances will take up the slack. Lemmy will live on. That’s how the fediverse works.
If you forget all the death, destruction, terror, and shattered lives, you realize that Putin’s decisions have been so absurd that this might almost be funny.
I can’t speak for others, but I don’t consider posts I made on a website I don’t own to be my property. If anything, it’s amusing to think of my idiotic rants making up a tiny fraction of an AIs “knowledge”.