I think Gates is right. What is the problem with the government controlling communication?
There are clear advantages, like handling illegal things.
What are the disadvantages, the nude photo of your ex-girlfriend being analyzed by a machine?
If you got connections to government, you can steal trade secrets from companies and enrich yourself and destroy the competition.
Destroy the lives of your political opponents by blackmailing.
Analyse and control the public sentiment to crush minorities.
I recommend you read a bit of stasi: https://en.m.wikipedia.org/wiki/Stasi
Also Bill Gates wants full government control because he is practically within the circles of government, obviously he would benefit from such agreements, but same cannot be said for plebs.
Anyhow, even if people like Bill Gates might benefit from such undemocratic agreements, tide can always turn against them and this level of censorship and surveillance can be used against them even more effectively than that is currently used againsts plebeians.
Iraq clearly has weapons of mass destruction. Censor all communications claiming otherwise.
The American government is not performing mass surveillance on its citizens. James Clapper Confirmed this in a Congressional Hearing. Censor all communication claiming otherwise
South Korea's President is not being influenced by a cult leader. Censor all communication claiming otherwise
And countless other examples where government controlling communication would lead to censorship of topics that the general public MUST hear. One cannot make an informed decision without information.