I don't have enough evidence except 10-20 minutes span in registration, 1 language and 3 hours interval of logout on 20th of july.
I will keep an eye on them to have more proofs.
Unfortunately, there is nothing that can be done and they might even get away with it because you didn't take your time to do due diligence to understand what the community would rely upon to act against them. For those that are smart and they get to know about the thread, they would then be smarter not to get any transaction to link them together or try to find a way to erase existing connection between them which if it takes a long period to find anything, you would also be tired and conclude maybe its just a mere coincidence which I believe its not.