Upvoting/downvoting people is a bad idea.
Also, followers already imply some of this.
That being said, I have seen bot accounts with more than 50 followers. If you can rate accounts, bots will fake that too, so it will not be helpful at all, but misleading.
If you see an account do bad things, like uploading malware, report the project. If you see an account uploading malware blog postings, report the account (by sending an email, since Itch unfortunately has no report button for such postings). If you see a spam account, you can report some of the indivdual comments.
