it's the Section 230 platform/publisher conundrum, which itself is kind of just a moral-positioning smokescreen for "we want advertisers to buy ads on our website and advertisers don't want their ads to appear alongside objectionable content".
This is a talking point that got beat dead in 2020 and I am shocked that it still has any life on HackerNews. It's not only moral positioning, it's a fundamental misunderstanding of what makes someone a publisher and what is actually covered as part of Section 230.
[0] https://www.eff.org/deeplinks/2020/12/publisher-or-platform-...