Add a new rule about access restriction

[TheFrenchGhosty]

Related to #396

I personally want instances owners to be able to block juridical person if they want to, but natural person (i.e Humans) shouldn't be blocked for any reason.

[SamantazFox]

I'd have also taken the opportunity to change the note right below:
that repeatedly breaks => that is breaking

[TheFrenchGhosty]

@SamantazFox Ah oops, looks like I merged too soon.

[SamantazFox]

I opened a new PR for that.

[tuxayo]

If an instance has in it's TOS "no nazis, no misogynists, no facists, no zionists (as in supporting the apartheid-like situation)" that should be ok. (and it's an arbitrary reason)

The «any natural person ([...], access by a natural person MUST NOT be disallowed for arbirary reason)» is a bit too simplistic in that it doesn't account for the systemic power struggles in the different societies.

That adds much more complexity and I don't think it makes sense for invidious so no worries until a case arrises. But let's keep that in mind if that happens. Or for other contexts when for example non-mixed policies might make sense. Or just rejection of political ideologies that intrinsically and strong violate basic human rights.

[TheFrenchGhosty]

@tuxayo

The «any natural person ([...], access by a natural person MUST NOT be disallowed for arbirary reason)» is a bit too simplistic in that it doesn't account for the systemic power struggles in the different societies.

That's the point.

A human shouldn't be disallowed access for arbitrary reason, including "power struggles in the different societies".