This kind of thing is easily answered with the works search. It’s only annoying if you want a bunch of different data for a chart. Currently, the works with >1000 comments number:
17,026
On a different note, IDK a good way to see a list of fandoms from works search, but if you go to a huge tag like m/m, you can put in a comments range and still get the sidebars. Out of m/m fic on AO3, the ones with >100 comments show:
Harry Potter – J. K. Rowling (10841)
방탄소년단 | Bangtan Boys | BTS (10022)
Marvel Cinematic Universe (8870)
僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga) (8836)
So about what you’d expect, really. Big, big fandoms and ones that have been active while AO3 has been popular. No doubt if I repeated this for some other category or rating or other big tag, you’d get a similar story: big-ass, currently-active fandoms. Searching for >1000 comments instead of >100 gets similar results, just with fandoms reordered slightly.
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