This was already done years ago by concentrating "the internet" and limiting it to a few companies with ban-hammers ready.
What once used to be many many different personal webpages, blogs, forums, chat sites (and protocols), is now basically limited to facebook (facebook, whatsapp, instagram), twitter and google (plus some outliers, such as telegram). Even with the mainstream news services, a huge percentage of people read that (MSM) news on sites like facebook and twitter (or atleast get linked from there).
Other countries have their own bundles of services (wechat in china, yandex+vk in russia, etc.)
So basically from a million different sources, pages, social groups, we've gone down to single digits per language group... and all of them can be monitored and censored by a few individuals with few agendas.