As long as the thing they don't like about your face isn't it's color. But seriously American employment laws (in most states) allow for companies to fire people for any non-protected reason (protected reason = gender, race, age, etc). If a co.pany does illegally fire a person it can be a real up hill battle to prove it because at-will is so permissive.
I can't say a firing like this one sits super well with me personally but it's almost certainly legal.
I can't figure out where all the lemmy people posting about reddits "power tripping power mods" were posting. I think I ran across one mod in the wild (niche sub) that I thought was crazy and they got run off the platform eventually. What were people posting that they were getting banned all over the place? Maybe the mods weren't the problem if multiple were banning you?