So apparently, recently someone took over the old YT channel of mine that I haven't used in ages: www.youtube.com/user/ZuTheSkun…
Problem is, it would appear that there isn't really anything I can do about it. I don't remember neither the email that the channel is attached to, nor the recovery email or phone number that it's supposed to use. Supposedly, there used to be a link with which you could try to claim your pre-Google YT channels ( www.youtube.com/gaia_link
), but it does not seem to be working anymore.
So unless someone comes up with some kind of miracle solution, the best I can do is add "Real Account" to the name of my actual, current YT channel: www.youtube.com/channel/UCQRhW…
This is so disheartening.
EDIT: I don't know how, but I just checked up again on that old channel and saw, to my utmost surprise, that it's now deleted?
Considering that this is what I planned to do with it anyways if I managed to get back my access to it, I think I can call it a happy end. I don't know if it's because someone here reported the channel or if it's because the thief himself decided to delete it, but I didn't have anything noteworthy on there anyways, so I'm glad it happened.