This is something that needs to be stopped. I cannot count on one hand how many times i have had to disqualify submissions and on one occasion I have been duked by a downloadable submission.
It would make sense for itch io to set up a system where if a game gets disqualified from more then one jam or the account itself has games removed from multiple jams to shut their account down. These spammers have a massive pattern that is really easy to recognize. That is my 2 cents.