I found out you can be banned by proxy. Post a comment on one sub that the moderator or another sub doesn't like and your get instantly banned off that other sub. I posted some comment on a covid related sub about a year ago and got instantly banned from 50+ subreddits, most I've never interacted with before.
And yea, that's why read-only on reddit this days and feel no desire to contribute.
I thought about 'sub based accounts' where a user name only posted in a particular sub and didn't care about what happened in the other ones. Then I thought "I don't give this much of a shit about reddit to do all that work".
Careful. I did this more or less by accident, with a main account, a porn account, and a goof off account. I didn't maintain a list of which ones had been banned from where and there were subscription overlaps.
One morning all of them - including the one that was 9 years old and had awards from participating in the first ever reddit gifts - got banned for "ban evasion".
Now I just make a new one every few months and distrust any account that can survive for more than a few years without getting banned.
So they encourage throwaways, but also ban you for using them.
meanwhile, there are tons of people who are relentlessly ban evading, posting threats and harassing material where reddit won't do anything about about.