There are some nodes that have gone for a zero-porn strategy; that does not at all address the other major prong of the legalities, though, which is #GDPR compliance.
That is (for examples) different for @trumpet in Scotland; for @wild1145, @Floppy, and @jaz in England+Wales; and yet again for the Mastodon.London owner who is in Germany and gets an unmodified Article 8.
https://www.legislation.gov.uk/uksi/2019/419/schedule/1/paragraph/8