None of those things necessarily constitute a monopoly - but when barriers to entry are too high to facilitate other entrants, when they have first dibs on all of the talent, deep lobbying power etc. then it can become monopolistic.
A good example is their commoditization of adjacent economies: they give Android away for free to make sure that there are few competitors who can make a dime there. Apple, the biggest company on the planet, being the only one who can hold a toe in that market.
Similarly as the default search engine on Chrome - Google definitely wants to make sure browsers are 'free' 'open source' etc so they can fuel the dominant entity and make sure the surpluses are captured in search, not elsewhere.
Microsoft would use their monopoly power in one area (OS) and leverage that into monopoly in other areas, i.e. office software.
If GM, Ford and Daimler Chrysler were to merge, they would be a monopoly even though the merged entity wouldn't meet any of the criteria you've highlighted.
Google can't necessarily be described in network effects either, but generally the very fact of their market penetration almost proves that there are systematic barriers.
They make gazillions of dollars - so why aren't there gazillions of competitors and tons of choice? Because of those barriers.
And they will keep extending themselves as they see fit to use billions of dollars to either dominate - or remove all surpluses form adjacent industries, thereby leaving the surpluses in their core offer, like search.
If you take a minute to consider why in 'free trade' deals, nations that participate are forbidden from government intervention in local companies. It's not really 'free trade' if for example the government can use tax base from the broader economy to support a strategic players and enable them to 'dump' their product on the market at what would otherwise be below market value. In that context, Google could be described as 'dumping' Android and Chrome on the market in some sense.
It's definitely grey but I think it's reasonable to consider Google as a monopoly.