I think you tend to oversimplify things a bit.

Of course, I agree that any amount of Bitcoin that you are sending away from your own wallets are at risk of loss, by definition.

But you have to admit that beyond the pure technical aspects of transactions and wallets, any economical system involves contracts at some point.

There is a significant difference in the semantics behind:

a) bitching about a breach of contract for "ethical" reasons (i.e. boo hoo),
b) defending one's interest after a breach of contract (i.e. due diligence)

While your reasoning applies pretty well to a), it ignores b) and makes it like there is nothing to be done after a breach of contract.

I will not waste my time and others' for a) here. If Deprived never shows up again, I will write off my loss as you say. I will survive, and yes, I knew it could happen. But I would be a fool and a bad manager if I wouldn't try to identify Deprived IRL and use any legal means necessary *and* proportionate to my debt due to recover it, by due diligence.

I'm just too poor to do nothing about it, at least yet