Only the owner of a copyright can enforce it.
Please don't post legal advice without appropriate qualifications. The above isn't the whole story in many jurisdictions, as there are other factors such as exclusive licensing to consider.
You understand the exact same applies to what you just said yourself?
It doesn't change the simple fact that, even when exclusively licensed (which is pretty much never going to happen with open source licenses, but let's entertain your line of thought here), the entity it is exclusively licensed has to actually exist in order to be able to enforce copyrights.
Using open source licenses with absolute anonimity is still impossible.