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Again, the porn ban at Tumblr was already in the works months before Apple delisted the app over CSAM issues - that just accelerated the implementation.
Most HNers wouldn't survive there though
It's not a site whose value can be judged in 5 min of viewing.
For instance, if you wanna be in the know about your favorite band's tour, tumblr is probably the best place to do it (even better than twitter due to the quality of discussion).
It's the closest thing to the fan forums of old we have in the social media era.