GUROchan is using Kolyma Network's Spam Database, read about it here: https://spam.kolyma.org/

Last night I tried disabling it altogether - meaning allowing all blacklisted IPs. Only in 5 minutes, we had around 20 spam posts. See this scene from our notifications server showing how bad the situation was after I disabled SpamDB at 2:28 AM: https://2ch.cx/src/1206.png
It's impossible to run GUROchan without KolymaNET's SpamDB protection. I immediately put it back after noticing that.

That said, it doesn't include all TOR IPs. About only a half is blocked because of intersection with IP range of a spam bot, so you can change your node until you find a working one.

Also, please title your threads in the future. I am making an exception for this thread by not deleting it, but I don't want thread overview to be full of "No Title" threads.