This suggests that you initially subscribed to Google Play Music at their launch special price, and were later grandfathered into getting YouTube Premium at the same price, or that you used YouTube Music Key (yes, more product roadmap confusion!) with the same outcome, or that you signed up with a student account (this is still $7.99 today).
This suggests that you initially subscribed to Google Play Music at their launch special price, and were later grandfathered into getting YouTube Premium at the same price, or that you used YouTube Music Key (yes, more product roadmap confusion!) with the same outcome, or that you signed up with a student account (this is still $7.99 today).