Apologies for the meta:
I feel that our understanding of trust and antitrust, along with the legal and regulatory premises... Just isn't very useful in the 21st century.
I understand the motivation, and justification for employing antitrust. Google's business model, and much of modern tech economy is really all about Monopoly-like market power.
In fact, one of the main concerns for AI investors is price competition, insufficient lock-in, weak network effects and consumer choice. They call this commodification... a telling choice of word. It's a worry that $trn valuations are impossible without something resembling monopoly to ensure longevity and high margins.
Peter Thiel gave a talk in favour of monopoly. It's worth reading. Even if you completely disagree, there are some subtle points that are relevant either way. A company facing market dynamism, price competition... Is unlikely to be investing billions in speculative r&d, for example.
Our core ideas about Monopoly, and antitrust... Tend to be highly derived of the industrial revolution, which is in turn all about manufacturing. Capital, labor, technology, marginal costs, marginal utility, price theory, etc. you can count the number which it's coming off the assembling line to understand the productivity of the firm. The product is concrete, and therefore productivity can be reasoned about.
There's no real way of applying this to Google. Google's users generally don't pay anything. Google doesn't have marginal costs.There is no price. The AdWords auction, is very clearly designed assuming monopolistic dynamics.. the seller is price maker and the buyer is a price taker. Prices are set as close as possible to buyer marginal value. Competition has no effect on pricing.
Otoh, where is the EU or any other antitrust regulator going with any of this. In the 90s, the Microsoft Monopoly was the biggest antitrust case. They used their os Monopoly to crush Netscape.
Now that it's history, we can look back and learn that the antitrust case just didn't matter one way or another. Nothing was really gained by victory, and nothing would have been lost by defeat.
The theory appears to be (a) regulated capitalism is good (b) tech monopolies clearly have market power and abuse it. There is no theory of desired outcome or the benefits of such an outcome. Are they regulating monopolies, preventing monopolies, pursuing an abstract notion of Justice?