I think Kiwifarms is (borderline) criminal. Null, the admin of the site, outright said he was ok with users posting stolen financial information, such as Social Security Numbers and Credit cards. Source: https://archive.is/0fOcS . There are many examples of private financial information being posted on the site.

I would describe them as operating with a paper thin layer of "plausible" deniability. Officially you aren't allowed to harass or interact with the targets. But posting their home address, stolen passwords, phone numbers, and information about relatives is all allowed.

But even the rule against interacting with "lolcows" (called "cowtipping") is haphazardly enforced. For example, one user had sex with a "lolcow" and posted photos. The admin explicitly said they would allow the content to remain up: https://archive.is/zYnpK#35%

I made the mistake of visiting the (archived) page linked to by the second Tweet from that (archived) feed announcing the conviction of someone of interest to them on several criminal counts, and what I read there was nightmare fuel potent enough that if these are the kind of people the site "stalks," I can't say I'm sympathetic. (Seriously, don't read it.)

A lot of their targets are more sympathetic. For instance, the moderators have said they are ok with doxxing children: https://ghostarchive.org/archive/DSt5K