It's 4chan that blocks tor, not 8kun.
Loli isn't allowed here, so the pedos lurk on 4chan's /b/.
What are you looking for and why do you feel a need to post through tor or VPN?
You know, VPNs have given information to the feds upon request and don't do much for anonymity, unless you use a dynamic IP VPN.
Also, there was a case that a university busted a bunch of pedos by acting as a tor exit node.
So again, illusion of safety.