If the gov't finds some issue with Paypal and takes action to shut down the business. (I know this is an extreme example but let's just take that as an assumption.)
Don't you think there will be another corporation that will pop up that does the same thing except adjusting their policies to follow the gov't? I am assuming we are talking about US here.
No, because who wants to start a corporation in a country where the money is worthless, and the government can take your assets?
When it gets bad, the corporations just shut down and leave, until the population screams blue murder and revolts.