This is interesting because it seems like the DOJ's definition of monopoly is changing, which I think is a good thing. Since the late 80s (roughly), antitrust litigation has only been brought on the basis of a monopoly's negative impact on consumer prices (i.e. does the existence of a monopoly cause the consumer to have to pay higher prices?). That ignores monopolies that impair the ability of smaller companies to en…
Google's dominant market position was achieved through market competition not through impairing the ability of smaller companies to enter markets. Even in Google Chrome you can pick DuckDuckGo and Ecosia as your default search engine. Most of Chrome users probably never heard of those two search engines. For example would YouTube be successful as it is today if it wasn't Google's resources and knowledge to skyrocket…
If the consumer market wanted an alternative, wouldn't there be competing companies by now that would ingest all that data and give you matching mail, docs, video, etc, services?
On the advertising front, Google is no longer the only game in town, so by definition not a monopoly.