There is no reason other than greed that tech companies have to have their fingers in so many pies. Regulators could split Google up - search separated from ads and separated from other services.

It’s not the size so much as the breadth of it’s influence. We’ve gotten used to the idea that tech companies like Google and Microsoft do everything. But they’re only doing everything so they can get at every bite of our data. An email service doesn’t need to be run alongside a search engine or a news aggregator or an ad company. And certainly doesn’t need integration between all those things.