I've yet to need this myself but as far as I've heard from peers who upload to Itch, they can't find a user option for blocking or banning an account from following their own, only from leaving a comment on a page (or hiding those comments from themselves—whichever is the actual mechanic).
Please correct me if I'm wrong on the existence of this feature. But the option to do so I think would put some folks at ease, knowing either that their content is hidden/inaccessible to harassing accounts, minimizing the amount of individual page moderation a creator has to do against a harassing account, and worry none for a notification that a creator has been followed and re-followed by a harassing account.
I would really appreciate an administrator's input on this feature's functionality and implementation—again if it turns out it doesn't exist. If it does, anyone please share how to do so! It's very much appreciated.