Im not saying for sure, just that it seems that way. I agree with you totally, lets be honest, happy people don't generally become reddit mods in the first place, especially of subs like whitepeopletwitter.

Idk, im not banned from it and frequent very similar subs (guns/gunmemes etc...) so I would think if they had a bot that it would catch me.

Im pretty sure the mods browse subreddits they don't like and ban people they see in the comments. A friend frequents gun subreddits and found out they were banned despite never having interacted with the sub before lol.