The app will also link all platforms. If you subscribe to Louis for example you will also get his videos on Odysee, Rumble and whatever else he has. That's what this string in his channel info does: 4Y1IC54hpe60aqaLCgjn7zlcSMH/IPxh5/cLnX6RKp0=
So if Youtube finally bans him, nothing will change for Grayjay users.
That's the real point of Grayjay I think. It aggregates Youtube, Twitch and all the other stuff. Nice side effect is getting rid of all the ads and providing its own spam free, uncensored comment section.