Yes, confirmed it now works again on Firefox Mobile. Today was the day where they switched over the domain, so I guess that makes sense.

Attempting to resize the system partition without backing the system up first (right after I spent the whole day setting everything up). Gparted failed, the system did not boot any more so I had to stay up the night to redo the whole setup. No personal data loss since the system was fresh, though.

Since I got into Linux via virtual machines and Raspberry Pi before using it as my daily driver, I made most of my stupid beginner mistakes (like changing permissions on systen files) where it did not really matter.

Nah, a private instance works fine. Public instances see a lot more traffic and if they use their public IP address for accesing YouTube it is trivial for YT to ban them. If you want to host a public instance, you should use a proxy or VPN for all the YT traffic so yo can easily change the IP address.