I was briefly a moderator of a sub with a few thousand subscribers, the amount of spam alone made me give it up. It’s relentless and never stops. The only thing that made it tolerable was the mod features in Apollo. I can’t imagine what it’s like with some of these really active communities with millions of subscribers. People just don’t realize how prevalent the spam/harassment truly is online, and Reddit screwing over the volunteers who clean up that shit is enough to keep me off for good.