I mean I’ve been a pirate for a WHILE and you generally do see ads on opensubtitles subs. Generally it’s opensubtitles saying you can advertise with them, or credits for subtitles that stay on the screen for way too long, but this has been a thing forever now, I don’t recall a time when this wasn’t done.
I don’t think I can take the moral high ground on it seeing as…well, I am a pirate lol. We out here doing our best to stay afloat, opensubtitles included.