The folks behind Tor have been looking for ways to deal with the fact that much of the web treats Tor visitors differently. It’s a tough problem to solve because for all the benefits that Tor provides by allowing people to be anonymous, it’s also very much a tool that is abused by some for nefarious purposes, including spamming and attacks. For sites that have any sort of heuristic systems in place, it often defaults to treating many, if not all, Tor users as second-class citizens.