People waiting for the bus stop to arrive, inside a bus

How? 😂

Monthly fee for everyone or you mean freemium? Freemium in my opinion wont be enough to cover the cost, because works well only with services with low cost per-user. And monthly fee for everyone is a very hight incentive of not using YouTube.

Unused ram is wasted ram

I think it would be very difficult on different service, but possibile on different instances of the same service