I got banned from Pokemon Go because my phone was rooted, never did geo hacking or anything. Just woke up one day and said I couldn't get in. It didn't really give me any information and it took some searching online to see that they just blanket banned rooted devices. I was upset, but whatever.

A year later I got a new phone so I decided to try it again. I tried my login and it said the account didn't exist. So I tried to make a new account with my username and said the username existed. So I tried to make a brand new account and it said my email was in use and I couldn't use it. So I tried the forgot password/recovery thing. Said account didn't exist. So I gave up. Sometimes companies just do weird stuff that is hostile to users.

Edit: I want to add that as a big linux user I've found that I can't get into many games because of blanket anti-cheat bans. I know my cases are niche, but there are weird blanket bans.