If you read the book, he directly explains that what's ideal for a company isn't necessarily what's ideal for society. For a company's founders or investors, it's pretty much always good to become a monopoly and that's completely legal, too. The anti-trust problems happen after a company already is a monopoly. The US government seems to have essentially ignored anti-trust issues during the Bush/Obama era, but enforcement used to be common.

During the MS anti-trust case in the 90s, it was common to hear things like "becoming a monopoly should be the goal of any business but once they succeed they can't use that monopoly to compete unfairly for another." It was lauded that the created the DOS/Windows monopoly, but it was illegal to force suppliers to bundle MS Word, IE or Media Player with each system and it was illegal to prevent them from pre-installing Word Perfect, Netscape or Real Player.

I don't think MS would have survived so unscathed if Gore had won, but it's impossible to know for sure. The political administration has a huge effect on how much these things are pursued, and it would be a huge deal if the Trump administration were to pursue anti-trust cases as aggressively as the Clinton administration did.