You can browse the forum and visit the registration form, which does not seem to block. I think it's allowed
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Problem with Tor and IP2 is that onion routing in a low-latency node based network is a fundamentally flawed concept. If you want anonymity against the feds, we will need a different conceptual design.
The way TOR is constructed is indeed drawing attention. I think, in order to have anonymity, a new conceptual design is needed as you mentioned.
What seem to be the issue on TOR network?
There are several issues. For one the mere usage of the TOR network itself, makes you into the subset of 'suspicious users'. The pool not using TOR is still larger. It's not a perfect solution. the NSA has a technique that targets outdated Firefox browsers codenamed EgotisticalGiraffe. It has several weaknesses, see https://en.wikipedia.org/wiki/Tor_%28anonymity_network%29#Weaknesses