I did look into it, I've seen these ideas before, and no, nobody wants to have an app or service than can just arbitrarily withdraw money from them haha.
This is the problem you've danced around a few times. Content producers do not price their content by the byte or by the minute. They charge premium prices for premium content. And they charge low rates for low-end content. The flat-rate per-unit-data billing model falls down as soon as content providers set their own rates (and they will demand to). Then not only is there a ton of perverse incentive (like content providers just setting the max rate all the time since they know you're not making a purchasing decision) but it also feels crap to know you have no (a) idea and (b) control over how much you're getting billed.
The only model that I can see working is a Netflix type model where you bill folks a fixed monthly fee, and you hand out the money to content producers based on agreements you negotiate. You aggregate the risk, you negotiate the pricing, you intermediate the customers and the content producers. You bill once a month, a fixed, predictable amount. No blockchain needed, just a Stripe account.
I'm uniquely qualified to answer this, I worked at a startup that considered building literally this 5 years ago. The payment mechanics were never the issue. The fundamental billing model and customer interaction dynamics were at issue. Nobody wanted it haha, according to our user research. Nothing has fundamentally changed by stapling the blockchain to it.
We actually got pretty far along building it - and had a bunch of high profile content producer relationships, you're welcome to reach out if you want to take the learnings. You seem involved in the project.