Making takedowns automatic on any user report means the dictators take down the apps of the dissidents.

In the absence of AI that would necessarily have to be good enough to also radically change society and the economy, the only solution I can even think of is a big increase in funding for the policing of apps. Who exactly would fund that? Governments would want to use such powers to pursue their own agendas, while Big Tech taking a proportion of App Store income is already being called “[Apple|Google] tax”.