I didn't realize they did this. So it means if I share a video with the identifier for example here, they can match my username here with my YouTube username. S

I didn't realize they did this. So it means if I share a video with the identifier for example here, they can match my username here with my YouTube username. Since my real identity is known to them via gmail, I pretty much lose all anonymity here as well (in their eyes at least). Then,if there's ever a leak of that data, my online identity is entirely compromised.