If you accept, a random post will be selected from the pool of all posts ever made on this sub. You then have to go through the hypothetical situation on that post. It could be one of those “do X for Y amount of money” that’s an easy yes, or it could be one of the ones where you’re put into a situation so deranged you wonder how someone thought this up and decided to put it on the internet.
If the post is something like “would you rather do X or Y”, you get to choose, but you have to make a choice.
There’s a chance this post gets pulled, in which case you have to accept this hypothetical situation and then another post gets pulled. That means there’s a nonzero probability of getting stuck in an infinite time loop where this post keeps getting randomly pulled.