I really have no idea why I was banned from those two communities specifically. I don’t think I’ve interacted with any of them (apart from reading/voting) for weeks. It’s not an instance ban.
If there is a better place to post this, please tell me.
EDIT:
I posted a link that was falsely flagged as malicious, have been unbanned! See comments for more details!
The reason is “automod.” If those communities set up an automod but misconfigured it, the bot might be overzealously banning people retroactively.
Most instances/communities that set up an automod usually just have it notify them of problematic posts, and a human checks to be sure. If it’s been a minute since you’ve posted there, it might be worth reaching out to the mods to see what happened and why.
Yeah, I already messaged a mod from each community, thanks!