It's volunteer work, which some people enjoy. Much like being a volunteer firefighter or member of a local club. I have modded across Discord, Twitch and also Reddit (for a short amount of time) and there is a certain joy it brings you. You get to care for a forum in which people like you discuss your favorite topics. You get to keep your own community clean and happy. And having that power and responsibility does give one a lot of joy. Think about it like it's parenting. Nobody is gonna pay you for having kids (in fact you're gonna lose a bunch of money), but when they succeed in life it makes you extremely happy.
That seals it then. Deleting my account tomorrow.