the nice thing is, if you use a custom skin on Ao3 then this is a great list of tags to add css blurb checks to style with 'display: none !important;'
I do advise making a new skin and naming it your Anti-AI list or whatever. Then adding it as a parent to your current custom skin instead of adding the list to the custom skin directly. Keeps things from getting too cluttered. As for what I mean by blurb checks...
.blurb:has(a[href*="AI-Generated"]),
.blurb:has(a[href$="/tags/thank%20you%20ai/works"]) {
display: none !important;
}
for partial matches use href*=
for exact matches use href$=
You can knock out a lot of tags with partial matches and unique tags with the exact matches - note that partial/exact matches are upper/lower case sensitive
And what does doing this accomplish you might wonder? Well, when Ao3's backend returns a set of search results, it'll still return fics that have these tags. But any works with those tags won't be displayed because any element with the blurb tag that has within it anchor elements (links) that match the href criteria will have their display setting set to 'none'. Goodbye AI generated fics.
So if there should be twenty fics displayed on the page but you only see 19, then you know that one of the fics that matched your search results was tagged as being a fic written with AI.
There are some tags I didn't include when creating my own blocklist because things like 'AI assistant' could refer to using AI to help write a fic or... it could refer to a character like JARVIS in the MCU acting as Tony's assistant. Sometimes what we intend to convey when using a tag isn't necessarily what the tag wranglers tie that tag to. And that is the downside to doing a blocklist like this because you might wind up blocking a bit more than intended. So that is something to consider when deciding how broad or narrow you want to make your blocklist.
Another plus to consider is that doing this in an Ao3 skin instead of using an external tool is that it'll work anywhere you're logged into your account. Your computer, your phone, your tablet, 3DS, Playstation browser, whatever you're getting your fanfic fix from.
But the TLDR is, if you don't want AI fanfics wasting your time when your looking for something good to read, then here's a way to hide them from view.