how can one tell if it's fake if its private?
If the domain owner is using domain privacy, then the contact details aren't fake, because the contact details are those of the domain privacy service. The 'real' (domain owner's) details are only known to the domain privacy service.
and anyway most people don't use real names and stuff when registering anyway
You've made a rather sweeping claim :-) Personally, I've never come across a valuable domain with obviously fake contact details. What kind of domains are you talking about?
If the domain owner is using domain privacy, then the contact details aren't fake, because the contact details are those of the domain privacy service. The 'real' (domain owner's) details are only known to the domain privacy service.
Are you sure? Doesn't the Name Privacy Service own the Domain? and you have a contract with them?
What happens if they decide you don't own the name?
Are you sure?
...about what? I'm guessing you're responding to the "The 'real' (domain owner's) details are only known to the domain privacy service." comment.
Doesn't the Name Privacy Service own the Domain? and you have a contract with them?
You're right - which is why I put 'real' in quotation marks. Perhaps I should have put 'owner' in quotation marks too :-)
What happens if they decide you don't own the name?
What usually happens if anyone breaks a contract? You talk to your lawyer
If any large domain privacy service decided to seize domains from their customers, they'd upset a few people. You'd hope that what they'd gain on the domain names they'd lose in lost future business... which means they won't try it (?)