The main 'premium' feature I remember from that app, being the ability to play the audio/video while running another app, and not having restrictions about WHAT you could do that with.

Honestly that's a bullshit feature to lock behind premium, given a PC can do it without.

But then Google more or less gave them the 'fuck you' and made the app unusable. Which I still feel has some antitrust connotations, as they waited until the platform became competent to do so.