That looks pretty awful IMO.
Extension suggestion: Enhancer for YouTube
https://addons.mozilla.org/en-US/firefox/addon/enhancer-for-youtube/
To keep it self working it prevents “expiramental layouts” from youtube.
Great for setting YouTube player defaults the way you want.
Sounds about right, From my understanding, they singled out TikTok instead of addressing the actual problem they claim to care about.
[Edit, another comment says its any app with 1million users. So now there’s just going to be a hundred TikTok clones all under the same umbrella just different names.]