you should already be rich enough to participate in this puzzle.
So, honestly speaking, this puzzle was made by a rich person for rich people—the rich will get richer, and the poor will get poorer. Right?

Yep... Or maybe you manage to use vast.ai for free by hacking their system—exploiting 3,000 GPUs, stolen credit cards, or even the puzzle creator himself, as you’ve already written somewhere. The problem is, you could end up in prison. It’s better to just go fishing.

Do you really think these puzzles are solved fairly? With savings? Who even has that much in savings? Come on!

Let's clear few things up:
1) This whole thing isn't any form of lottery or puzzle or any other "play" for fun
2) This whole thing isn't meant to make someone happy or make someone poor rich
3) Nobody has the obligation to do anything with it
4) This whole thing is made as an indicator of how safe bitcoin is at current time (some sort of measurement tool for how much cracking power is available out there to attack bitcoin cryptograhy)
You are here long enough to know that i think...
Yes, it's frustrating to see "free" money sitting there but we can't grab them but the bitter truth is ... it's over for small players.
I will still be watchinge the progress but it's better to do something else than wasting energy and time on this at this point of difficulty.