Tor is not a VPN, it's de facto public service that's used by a mass of people around the world.
But anyway, if it's really necessary to block the whole Tor network then ban it for a few hours or a day, not permanently
. This is enough to make the spammers give up because bunkerchan is not a target of organized and determined cyber armies, the trolls are poltard coomers seeking immediate satisfaction.
Tor users are used to being 2nd class netizens, so a temporary
ban is not that bad. Bunkerchan is the only platform for surveillance-conscious/paranoid leftists. Other social media is completely blocking participation via Tor.