YouTube's pricing is a mess. Here's a quick breakdown of their offer here in France :
YouTube Premium (so video + music): 12€/m
YouTube Music Premium (music only, obviously): 10€/m
One would assume based on this that Google values YouTube at only 2€/m per user. But anyway, let's take a look at their family plans for a laugh:
YouTube Premium (6 users): 18€/m
YouTube Music Premium (6 users still): 15€/m
Let's put aside the price discrepancy. 18/6 = 3€/m per user. All signs point to Google being ok with making between 2 and 3€ per user per month, yet such an offer doesn't exist. Hell, make it 4€, even. People would flock to it. But no, they're just being greedy.