Or say you live in a small town with one grocery store, and they don't like your BLM tshirt so one day they ban you. Private company, they can do that. But now where do you buy food?
Or your Brand X car breaks down, but Brand X decides they don't want you in any Brand X dealerships anymore, but the problem is your car needs a specific diagnostic tool only available to Brand X dealers.
The examples are endless
And I agree, the internet monopoly is a huge issue. The internet should become widely available to all. I would say as a utility, but that then points out the fact that I have one giant power company that could also, censor me and cut me off from my only main source of power... hmmm...
I must be missing something because I cannot imagine why everyone is so tolerant of companies having nation-state level ability to ruin lives, and to routinely face no consequences when they do so.