This will be the main reason. Also it is using Tor only because I noticed that the exchange has no clearnet? If clearnet is there and no mention of dirty and clean, it would have been allowed. I will be expecting the exchange to come in new way.
This is wrong. The problem is not in "kycfree" or "only-Tor", with a 99% probability the thread was moved to the archive because the interface allows you to exchange "bitcoins for bitcoins".