Around 2 years ago I got incorrectly banned site wide for 3 days for "ban evasion". Haven't used it ever since (except through google searches). There's no downside to leaving reddit really.
probably the cabal of mods that run the more popular subreddits. I deleted an account because of that; I had posted in one of the antivax subs about how stupid people in there were being and the popular reddit mod cabal sentenced anyone who posted ever in a slew of those antivax subs to "bans" and if you used a different account you were "ban evading". It's a petty power play by very small minded people to hurt those even though reddit possesses no mechanism to know you are "banned" in a sub other than a one time message. It just shows how pathetic and small their lives must be to try and reach out and cause other folks trouble
I'm not sure that one who purposely goes into subreddits of topics one disagrees with to throw insults and start arguments is exactly a model user, in fairness.
Those were subreddits of conspiracy theorists and propaganda bots, I didn't really care all that much about their feelings. I wasn't banned for speaking out against it, I was banned because I commented at all in those subs and the moderators HATED said subs because they were anti-vax cesspools and assume anyone who would go there opposed their world views. You deserved punishment even if you had never even so much as read their "popular" forum. It was a power play and ego boost for them, maybe to make up for holes in their own lives so they could feel powerful at least somewhere.