This is explained on this support answer
It’s a thing on Revanced YT even if spoofing an old version.
Apparently applies to the web version?
This is explained on this support answer
It’s a thing on Revanced YT even if spoofing an old version.
Apparently applies to the web version?
What’s up with the weird logo on YouTube lately?
Click it and it will show you.
Some calligraphy thing