Earlier quoted context omitted.
Actually amazon is the one that I would say doesn't have a monopoly. It doesn't have a monopoly in the retail space (far from it), nor in the cloud hosting (let alone server hosting) business, nor in online streaming (music/tv). Google on the other hand has close to a monopoly on search (and browsers). Facebook on social medias.
The typical antitrust concerns around monopolies don't really apply to google (currently). Google hasn't used its position to create barriers to entry for competitors, it is only that google has a reputation for producing a superior product in this domain. I've also heard some argue that google has a monopoly on advertising eyeballs, but this is clearly false (i.e. there are lots of platforms that make a lot of money…
Just thinking out loud, really.