Second-person fic got a lot less stigmatized because of Homestuck, although Homestuck second-person is generally very different from Character/Reader fic. But I think a lot of it is still similar in taking its inspiration from gaming - it's being done as if it's an rpg dating sim and "you" is the player character. Although I also I think what we're seeing here is the generation of people who came up writing stuff like 1D and Twilight and Glee fic on Wattpad - there was never a shortage of it there - moving into less fragmented fandoms and posting stuff on AO3.

(although also I wouldn't count on it being good just because it's high in the kudos ranks on AO3; there is a cohort of anti-kylo-ren troll-kudosers who for awhile were deliberately upvoting deliberate badfic.)

(I mean, there's also one that ships him with Ebony Dark'ness Dementia Raven Way pretty high in that list.)