I have been asking for the questioner (and only the person asking the question) to be able to downvote an answer and remove any points associated with the irrelevant answer. I do not suggest this is anonymous, and I do not suggest anyone but the questioner be given that ability. I know that previously, anyone could downvote for any reason and that this was done anonymously.
I don't ask many questions and when I do, they are very specific questions. I'm often dismayed that the person answering has obviously NOT read the whole question or worse, is plainly scamming the Research Gate score system.
The whole idea is to remove any points the scammer has obtained for answering the question so that they STOP giving, worse than useless answers. i.e. it removes any incentive to reply and game the system.
Better still would be the ability to delete such an answer from our questions but I doubt we could ever get that.
Be warned, I already report such answers to Admin. You are welcome to join the discussion but don't give a scam answer!