The whole business model of Silicon Valley is finding companies that can grow to become abusive monopolies, and then growing them into that. Cut off one head and two will take its place.
The thing you point to is the model for which Capitalism selects, not some local quirk of Silicon Valley.
A lot of the infrastructure of modern mixed economies is dedicated to maintaining some space for such businesses against the natural forces of capitalism, as part of the broader purpose of modern mixed economies of providing sufficient mitigation of the clear adverse effects of capitalism to relieve pressure for more radical reform, sure.
That is not inconsistent with the fact that the basic nature of the capitalist property system is to promote the creation of productive monopolies from which monopoly rents can be extracted. Actually, that fact is why that effort is necessary.