I've mostly seen it in r/ModCoord, where a lot of discussion around Reddit protests goes down. Lately I think the mods there have been trying to stop it, but it definitely shows. These are the ones I assume are bots, or at least some of them, judging by the way they argue.

The other random place I saw it was r/PokemonROMHacks when it reopened. People there were super critical of the mods, and I think it's mostly because they aren't users who normally use reddit and are only there to try to download and troubleshoot Pokemon hacks. To them, the mods making the sub private seemed incredibly selfish.