> I have money and I have a URL, how do I send money to the publisher of that URL?

This question could easily be “I have money and I have a person’s name and address, how do I send money to them?”

The only way to do this consistently would be to mail them physical cash, since there’s no way to consistently send money electronically across the world (and you’d have a currency conversion problem too - if someone mailed me US$0.23, it’s not worth exchanging it).

Building micropayments infrastructure requires building broader financial infrastructure, not just adding a meta tag. This can use existing infrastructure to some extent, but it’s a pretty big challenge.

(For example, in Australia, you can send someone money if you have their email address (via PayID), so you could bootstrap that part - minus the international part.)