Sure, it may be posted, but lots of it is removed as soon as it is identified and/or reported.
Policies don't mean anything when a huge amount of it stays up and the platform does nothing about it.
There are posts literally and explicitly calling for people to murder others on Twitter. The posts have been there for multiple years (at least the last time I checked). Twitter and the other big players completely fail at content moderation.
wink wink
Also, due to the sheer size, Twitter and the others almost certainly have significantly more of these types of posts.
For example, this post contains an address:
https://kiwifarms.net/threads/onision-james-gregory-jackson-...
Here is a post containing the IP of some user:
https://kiwifarms.net/threads/leonard-f-shaner-jr.9940/page-...
Here is a list of past addresses for someone:
https://kiwifarms.net/threads/russell-greer-just_some_dude_n...
Past addresses isn't doxing.
You have one example. I do appreciate the example. I don't really think 1 post is really systematic though. You could easily find an address on any of the big players. They appear to remove posts that get reported so it is possible this one wasn't reported.