Several years ago I (briefly) worked at a startup that was trying to do this for publishing (but has since pivoted into generic ad-tech). My impression at the time was that most publishers weren’t onboard. True or not, they seemed to think if you’d pay a penny for an article then you might but a subscription and so they want you to make an account, want your contact info so they can send you spam, etc.
The other issue is that big name publishers saw micropayments as eating into their subscription revenue and weren’t interested, but without them it was hard to put together a compelling enough bundle of sites to overcome the signup friction for users.
I still think it’s a good idea but I don’t see how you overcome those obstacles.