[AlexandrB]

The idea that monopolies are formed due to government intervention runs counter to my lived experience of watching the Google Search and Facebook monopolies form in largely unregulated markets. The only viable competitors to Facebook were acquired before they could become a threat, Google meanwhile has used its search monopoly to fund monopolistic takeovers of other markets (web browsers come to mind).

[shagie]

You also get into the regulatory capture. Could anyone today create another YouTube with all of the necessary content controls for all the different countries in place? Or create a baby formula making company for current events?

It's possible - just it represents a significant amount of work that needs to be invested in the product before it can see the light of day (compared to other domains where there's less needed to invest).