such tasks are already given by some companies to get rewards, for the same likes or comments, or for putting on their personal profile avatars)
But I guess it's not being paid with crypto and it's not everything on a single site. If it is, you're free to post links.
We're not talking about simple advertising like tweets but something more extreme. Imagine going on the roof of a skyscraper and hanging a huge banner for the whole town to see. I know things like that aren't completely legal, but it's not like you're going to jail for it. I bet people would be willing to risk a fine if the pay was good.