How is that a rebuttal to his point? There is currently regulation, and you claim you don't encounter unofficial monopolies. Who says it would stay that way?

It's peculiar we're discussing this here. Even though I don't hate them, Microsoft was a practical monopoly for almost two decades and caused immense harm just by forcing everyone to adapt to them. Linux wouldn't be a competitor if it weren't for the countless hours people wasted reverse engineering file formats.

Just because even monopolies will eventually fail doesn't mean they can't cause a lot of harm before that.