I don't follow the author's argument at all. Let's say the restriction on binding to port 80 was removed - in the example provided of 50 users all wanting to ru

I don't follow the author's argument at all. Let's say the restriction on binding to port 80 was removed - in the example provided of 50 users all wanting to run Wordpress, how does that work? 50 processes (especially from different users) can't all bind to the same socket, and the use of nonstandard ports is _explicitly_ rejected ("everyone has to enter your site's web address with a stupid :### at the end of the host name").