Earlier quoted context omitted.
You can't simultaneously advocate for superior free-market solutions and then complain when the government outcompetes the private sector.
I can when the government gives itself advantages that it doesn't give the private sector, like subsidies, taxes (paid whether you use the service or not), and regulatory exceptions.
Amazon just had a big contest on subsidies and the only exceptional thing about it was how brazen they were about it. Regulatory exceptions often are part of such deals.
> taxes (paid whether you use the service or not)
Monopolists call that "bundling". For example co-financing internet service by requiring you also pay for phone service.
The main difference is that a public service doesn't need to have profit maximizing as its primary goal.