Wait a minute, did I misunderstand? I thought we were talking about how websites would make money, not build browsers. Are you saying that Apple, who doesn’t depend on web advertising AFAICT, wouldn’t build this hypothetical browser because other companies wouldn’t make money? A more macro economic view, then?
This is the problem. A much less complex browser, without wasm, without JavaScript, with a simpler DOM... would not be that incredibly complex and expensive to build. So the point is moot.