The WC of chess earns a good slice of the pot from the tournaments they attend, but make a lot more on their personal brand. Books, appearances, autographs etc. Not too many sponsorships in chess that I can think of, it's not nearly high profile enough like other sports.

Of late there's more money coming in for chess pros by way of streaming on Twitch and selling online course packs. YouTube videos too, there's a few chess players making good money there.

But yeah, mostly none of the money in chess comes from playing chess.