He does so because he is essentially ineffectual opposition, like the rest of the "Intellectual Dark Web" they are meant to enforce the "boundaries of reasonable discussion" and to do that they still need to engage with the mainstream progressive institutions. At the least his opposition alone will not result in meaningful change or damage to the institutions so they don't need to worry as much about censorship.

He does so because he is essentially controlled opposition, like the rest of the "Intellectual Dark Web" they are meant to enforce the "boundaries of reasonable discussion" and to do that they still need to engage with the mainstream progressive institutions. At the least his opposition alone will not result in meaningful change or damage to the institutions so they don't need to worry as much about censorship.