There is an important reason behind that Real Name thing..
.. and it is the EXACT reason why you ought to use a fake name in the first place.
When you sign up to such a service, you engage in a contract. From a right perspective it's fantastically one-sided and contains IMHO some seriously deceptive language, but TL:DR or not, you accept when you join.
The problem for Google, and Facebook is that a fake name on the contract means they don't have the permission of the actual owner of the media to use their material forever, and that creates a lovely one-sided rights problem, in favour of the end user.
At best the company can bar or close the account, but it is not able to sanction the user as it has no contract. In reverse, however, the user DOES retain the rights due to normal copyright laws, and so Google and Facebook are at risk if they try to re-use that for other purposes without permission. Oops.
IANAL, though, but to be honest, I'd love to see that one go to court.