Earlier quoted context omitted.
In 20 years it will be impossible to manually browse to an unapproved "unsafe" URL in a general purpose browser.
Well, its hardly possible to manually browse an unapproved unsafe URL even today. Ever tried to browse a site with a self-signed certificate? In most browsers you have to do a lot of extra clicks to get in. But there will always be special purpose browsers. There is "TOR browser" today, and we will have "vintage web browsers" the same way we have CLI/TLI browsers still today (thinking of elinks and lynx), or the same…
You can get one issued for free just by demonstrating that you actually control the domain.