Some people don't want to be paid. They do things as a hobby and for fun. As soon as one is being paid there is a ned to publish more and good quality stuff, which turns a fun project into work.
The web already has lots of options for people who don't want to be paid. That's not the problem!
The problem is that there's no web-standard way for people who do want to be paid to indicate how.
This also means that the people who want to be paid will tell you exactly how on their page. E.g., all the “buy me a coffee” links you can find on open source projects.
The author of this article wants a special HTML meta property but we’ve already that solved: plain text and hyperlinks.
Agreed. If you don't think you'll bring in material revenue (by your standards), it's often not worth collecting any at all.
That is sad reality. As an example, I wish Sabine Hossenfelder didn't have to leave academia. Her content (blog posts not videos) were one of the ways I kept up with development in theoretical physics. But now that she is a full time video content creator, she is under pressure to publish click bait and very questionable content. I understand that she is catering to the audience but this is one example why alignment of the incentives works. Before, she was earning her living as a working physicist so she did not have to cater to anyone actually and she produced very good content -with exceptions- for years.