They don't seem fussy about replacing mods even for no real reason at all. This happened on r/panelshow. There was one mod, the founder, who ran it by herself for years, quietly deleting spam and off topic posts. Then this narcissistic guy who posts under his full legal name comes in and decides he wants to be added as a mod. She ignores his messages, so he goes to the admins and says she's inactive. They add him as a mod, she doesn't know what's going on, removes him, so he threw a fit and had the admins reinstate him and boot her.

He's completely taken over the sub the last couple years. He posts repetitive long essays about his modding and stickies them, deletes any comments even slightly critical of him and threatens to ban people left and right. He banned one woman, one of the most active members of the sub, who was almost annoyingly inoffensive, for asking him why he posted a screenshot to show someone a report making fun of them in a really hurtful way (he constantly posts screenshots of reports so he can respond to them with sassy comebacks), then quietly reversed the ban after being called out by multiple people. He even created a completely new subreddit to post about his modding of this one small subreddit. He inserts himself everywhere and then takes it personally when people criticize the way the sub is run. It took over a year of begging to get him to finally add a couple other people as mods to keep him in check and he of course only accepted people who are completely obedient to him.

It's quieted down a bit the last few months since most of the people who pipe up have been banned or left for a competing sub, but it was one of the most mundanely strange power trips I've seen. It's so odd and such a random subreddit to take over and cause so much drama.