All rules are arbitrary, though, and if you want to participate in a community you have to abide by the rules. If the rules are stupid enough, anybody can splinter off and say they're starting their own community, especially on the internet!
I mean, look at HN here. I'm on my third account: the first, I have no idea why I got hellbanned; the second, I know exactly why; the third, I don't really care about. But it's interesting to read the stories and ideas I fundamentally disagree with, and occasionally I post something detrimental to my fully participating in this community. Those are the rules.