Few years ago I was invited to mod a small but growing community.
About a year later the sub founder (and other mods) just gradually disappeared.
When I brought this up, the top mod (a month later and without warning) removed everyone and asked to DM him if we wanted to continue being mods.
Every single person re-applied, but the inactivity continued.
When I looked at their profile, it turned out they were moderating dozens of subs, and according to the moderation log, I was the only one who actually performed any mod actions in the last 6 months.
This was when I took my leave.
Again, we're talking about a small ~20k community.
I can't even imagine the kind of clout chasing that goes around in large subs.