I just checked my subscriptions and my YouTube Premium is still grandfathered in at $9.99/mo from my Google Play Music subscription that included Google Red.
Myself and family listen to music all the time, and YouTube without ads has paid for itself with dev tutorials, DIY videos and other educational stuff; I can’t run aBO on my TV. As soon as they find a way to kick me off my current rate, I’ll bail, but until then I can’t find a cheaper fit for my needs.