Katie is Katie Starling, a content creator who makes a lot of incest and 4g3play content that is prohibited here. She also runs a separate website, which I won't link here, but is called p3rv3rt p4r4dise (replace the numbers with the actual letters).
I made the mistake of joining that site once, it was basically a slow, shitty web-based clone of Discord at the time. Without getting too specific, it was too extreme for my tastes. Lots of people there talking about their p3do tendencies and why looking at CSAM has been a lifelong struggle for them, etc.
I panicked that I was even associated with a site like that and deleted the account and left. While I didn't see any actually CSAM on the site, and I've been told they go to great lengths to prevent it, they get as close as you possibly can to CSAM without having any. Anime, renders, stories, audios, caption photos with text that would make a jury trial throw away the key even if you hadn't broken any actual laws just because somebody who reads stuff like that probably shouldn't be around other people, in their mind. Even though it's been a while I still worry that when that site gets shut down (and I have no doubt that it will - if they shut down m0therless they'll shut down this one) somebody will run a list of emails that were registered and I'll get a visit from the cops even though I broke zero laws and saw no actual illegal content, the chat channels there were definitely full of people who had served time for CSAM and were talking about "recently relapsing this afternoon" and stuff. Just like...guys...wtf is this?