Allow me to give you a reminder that, until quite recently, USPS was run by a Trump-appointed stooge who intentionally sabotaged mail service in order to try to reduce the impact of mail-in voting.
You really need to keep in mind, when proposing the government take over an entire industry, that in America a good 50% of the time that government will be run by hapless malicious morons. I, personally, would not want Donald Trump to be in a position to unilaterally decide what the American internet looks like and to arbitrarily ban whatever he thinks is harmful to his interests.