I know of AerynOS and Chimera Linux but AerynOS still in alpha and have suffered a few issues with Kwin and I am just not technical or dedicated enough to setup something like Chimera Linux.
I know some might say this is a losing battle and you can never 100% sure of something did not use AI but I try my best to find things that promise no AI, plus, I want to support some of them monetarily so they continue getting developed.
Maybe also being into gaming does not help my case T-T
Regrettably, I don’t think there’s a good middle ground distribution that’s anti-AI. It’s either very technical distributions like Chimera and Gentoo or opinionated distributions geared towards newcomers like elementary OS or more specialized distributions like Nura (formerly postmarketOS) that are explicitly anti-AI.
I think your best bet would be to go with elementary OS, honestly. It uses its own DE, Pantheon, rather than KDE, but I think it’s easily your least worst option. I’ve never used it extensively myself, however.
Of course, I also am obligated to mention that the Linux kernel is extremely pro-AI. However, an anti-AI Linux distribution is leagues better than using, say, Windows when it comes to AI.
That being said, here’s a list of distributions known to be affected by AI as well as those that are anti-AI.