Off-Topic@Heyuri is fairly random, but it isn't a "random board" like 4chan's "/b/ - Random" (where the commonly-held-but-far-from-true belief is that "the only rule is that there are no rules, anything goes as long as it's legal"). There are established rules about what can and can't be posted (p00p currently falling in teh "can" camp), and they are enforced with baleetions and/or bans when they're broken

Rule 8's purpose is less about being a barrier between "old and new imageboard culture", but more about clearing out certain forms of crap (metaphorically speaking...) that have historically bogged down many imageboards and other interweb communities over the past 10-15 years - this allows Heyuri to be "Heyuri" rather than a generic "it's present-day 4chan but with 3 monthly users" website like we've all seen and rolled our eyes at before

New material from 4chan or elsewhere doesn't automatically = Rule 8, but dumb "troll technique of the week/month/year/jesus-christ-are-u-srsly-still-posting-this" stuff is usually アウト, and posting one community's in-jokes to another community is usually lame