Doxxing is no joke. Posting a persons private information online with the purpose of inciting threats, intimidation or assault against them is very illegal. Innocent people have died after having their info leaked online which led to them being swatted.
Even CP has a rule against it in the TOS:
8. Don't post anything harmful or dangerous to another poster's welfare. This includes
posting personal information, viruses or malicious links, and posts designed to abuse or threaten the mental or physical welfare of the other poster.