for normal subs, browse all time top posts via this url: anvaka.github.io/map-of-reddit
but notice this doesn't include quarantined subs, so go google a list of quarantined subs and somehow rank those by number of subscribers
for banned posts: use reveddit. if you're on saidit, yeah, use that tool. use duckduckgo to search for it and view all the banned posts.