Honestly, one of my favourite subs despite the very strict moderation (every post had to be manually approved) was r/tombstoning. Literally just images of newspaper articles where the headline and any related images/articles were very unfortunately placed. The mods basically ensured no reposts or posts that weren’t quite correct got in - so the sub basically got a reputation of only having a post every other week or so, but when you saw a tombstoning post you’d know it was quality.