Every time I see a service purporting that it works best only with a single link to your Real Identity™, I'm reminded that the vendors only abstractly care about actually protecting the user, and then only sometimes.
Imagine being able get immediately three or four steps closer to doxing anyone interacting on YouTube. That's the actual impact of this bug IMO. It's good that this was fixed, but I don't think this class of bug goes away anytime soon. What do we need to do to get vendors and big companies to realize that this sort of design is landmines waiting to happen?