The problem of these companies isn't size, it's their make up. Google only has an advertising business because they're dominant in search. The point of these b

The problem of these companies isn't size, it's their make up. Google only has an advertising business because they're dominant in search. The point of these businesses isn't to make the total size of the companies smaller, it's to increase competition. The advertising side of Google might be as big as it was before the split, but once it actually has to compete with other companies for ad space on Google's search engine there's suddenly a competitive market for advertising on search that previously there wasn't. Without the monopoly on search result ads Google's ad business suddenly won't be able to leverage that into being dominant selling adverts through their Adsense. It's about the fact that there is an entire market that has been closed because Google has a monopolistic power to bundle.