The way monopoly law works in the US, it's not illegal to have a monopoly. It's illegal to try to leverage your monopoly to acquire a monopoly on a different l

The way monopoly law works in the US, it's not illegal to have a monopoly. It's illegal to try to leverage your monopoly to acquire a monopoly on a different line of business. For example, it was found to be illegal for Microsoft to use the Windows monopoly to try to acquire a monopoly on web browsers. This is kind of going the other way. Google had a monopoly on search (arguably - Bing would like a word). All these other actions are to keep that from being eroded. They didn't do Chrome because they wanted to own the browser market, they did Chrome because they wanted browsers to not be owned by somebody else who could make the default search engine be not-Google. That's entering other businesses to protect your main one. IANAL, but that may not be against antitrust law. It's at least not the main thrust of antitrust law.