Take it you didn’t click “learn more”?

To sign into YouTube, you need to sign into Google.Com. that’s the cross site script. Nothing scary, or unexpected.

https://www.monkeyuser.com/2019/bug-fixing-ways/

Saved you a click: “In a nutshell, if an app needs special permissions that can only be granted through ADB (or with root), you can just use Shizuku to grant them right from your Android device.”