As a staffer:
Summarily banned, with no warning or even notification, a player who’d been RPing sex with child PCs.
Banned somebody who wanted NPCs to be dumb for them and refused to accept “no” for an answer and shut up about it.
Banned somebody who was edging up to gross teen sex stuff, and also was just a problem for not complying to course-corrections regarding theme, so I was already every week telling them stuff like, “No, animals are just animals and you don’t have a gull friend that steals food for you,” and such. This player was actually a lot of fun, I thought, but they just wouldn’t stop being a little too special.
Banned someone who refused to RP IC consequences and tried to escape them by disconnecting or going OOC, and got really rude when told that their PC would have to deal with the situation, not wait for everyone to forget it.
Didn’t ban, but had a player cuss at me and leave because the game was not what they wanted it to be. Which was fine, though I am sorry he’d wasted enough time thinking things were otherwise that it felt like a cheat to him.
Didn’t ban, but should have, somebody who was really bothering other players by using them for emotional support when they didn’t want to take on that role. I knew this was a problem and had talked to the player about it, but I didn’t know it was as big a problem as it was, and the players being harmed were shy to tell me and just left. I ought to have been more proactive about that, the fear-of-staff thing is a problem to overcome.
I didn’t have other staffers to ask. There was no backlash that I was aware of. Three in five got subdued cheers.
As a player:
Not banned, but asked to make a new, less depressing, PC, or leave, since I didn’t fit the intended tone of the game. It was polite and clear, and I did as asked.
Actually banned. From my PoV, it was that the staffer, a former friend, had decided abruptly that they didn’t like me/want to play with me any more but didn’t tell me in words, but by treating me like shit and responding to my “why are you treating me like shit?” and “that was shitty,” by claiming it was a mistake and that we were friends while campaigning against me to others, getting really wound up about it, and imagining/claiming that twice monthly interactions with me were daily rants and harassment. It was far from without warning, but the warnings all came with denials, and direct ‘am I even welcome on this game?’ questions answered with repeated lies of ‘we’re friends, you are wanted, stay’ to me but seen as a violation of boundaries as if an autistic guy is gonna see the unstated line when you’re directly communicating that it’s not there.