I am actually suprised there isn't, but i think against this kind of spam it won't do much, cause i looked more into the profile of the spammer, it is a 2 mayby 3 day old account by now.
So pretty sure reuploaded games from other creators passed of as their own so even if you could ban them. With the type of spam, i am sure it most be bot created account or something.
With nothing preventing sadly from even more new ones being created to do the same. Unless there is a way to set up a minimum itch.io account age, to submit to a jam.
But that leaves its own problems. With that i am sure some people have created accounts in the past just to legit join the jam!
I guess the only thing to do is to remain vigilant and update here or if you have a direct contact point or malic has one directly to you guys to help you notice it.
That said I am now going to focus on the nice parts of the jam! Got to comment on some submission i played.