Even categories that are supposed to be for specific mediums where AI shouldn't be applicable are full of it regardless - just now I scanned the Photography section and almost immediately spotted a conspicuously three-fingered woman. Posts made using AI are supposed to be tagged as such so users can opt-out of seeing them, but that "photo" isn't tagged, nor is anything else on the uploaders profile despite all of it being blatant AI.
You could almost turn it into a game - pick a random category and see how far you have to scroll before you see anything at all that doesn't scream "babbies first copy-pasted MidJourney prompt".