My guilty pleasure is fanfiction, lol. I haven't written any in a long time, but I still occasionally read it, and I have indeed noticed TQ+ nonsense creeping in over the years. It's mostly prevalent in modern fandoms. Older properties are pretty safe because most of the fanfiction for them was written before the TQ+ trend started, younger people aren't interested in older fandoms, and the fanbase just tends to skew older.

For instance, I'm currently into Star Trek: Voyager, and I love me some Captain Janeway and Seven of Nine. I use Archive of Our Own, and though there are some recent fics, most of them are much older-- I have not seen any TQ+ crap, just purely bi/lesbian stuff that was clearly written by actual bi/lesbian women.

On the flip side, modern properties are a goddamn minefield. I've seen stories where they've turned female characters into MtF transwomen (Regina from Once Upon a Time, and Rizzoli from Rizzoli and Isles). That is just so insulting to me on a visceral level, that these strong, intelligent, confident women MUST ACTUALLY be men. And of course there's girldick involved. At least with AO3's tagging system, you usually get a heads-up for the content of the story, because the TRAs just can't help but announce how 'uwu inclusive' they are. I've noticed that if there's girldick, they tend to tag it "g!d" or something similar, so hopefully that helps you avoid some surprises.