Eh, that's too expensive unless the recipient can authorize refunds for non-spam emails.

But yes, I always thought some form of network syndication would emerge on the Web, where creators could register for their share of aggregated periodic payments made by users.

Still not sure why that's not a thing. I would pay $50/month to a syndicate in return for never having to deal with paywalls on any sites affiliated with them. But only as long as the vast majority of sites participated, and that is probably the showstopper, I guess. We'd end up paying 20 different 'syndicates' for absolutely no good reason, just as we now have to deal with 20 different streaming services.