I don't think that everyone is going to agree on something like this so it is going to come down to you doing your own tests. Personally, I don't think a domain is going to survive if you are getting subs banned. When there are flags raised, I am sure it doesn't take much for G to audit everything else on that domain. And yes, certain sites like Wordpress etc that offer subs to the public get a pass on some rules as they are a recognized domain/service.
Good luck with testing....be sure to do it with something automated though so that you don't gamble away everything.