You're making the mistake of assuming that 100% of the unpaid work performed by a few niche subreddits converts to equivalent wages on the free labour market.

Is anyone going to pay first-world wages for someone to moderate a subreddit? It doesn't seem like anyone is willing to do so, because the mods do it for free. Nobody is willing to pay for this service. Social media companies that do pay for moderators tend to pay them not well at all. It's not a great job. It burns people out. It is in fact entry-level no-experience-needed grunt work.

Your calculations are vastly over-inflated.