Forcing content out off mainstream media quite plainly does limit the spread of information and does limit radicalisation, we have plenty of examples of that. Conartists rack up millions of views because they can use free infrastructure of companies (companies that in turn convert human attention into profit via advertising, the sale of user data etc.). Without access to the infrastructure they can't have their business flourish as it does.

The link with Brexit and T you make doesn't make sense either, both of these phenomenon got plenty public exposure, with all information available to those who wanted to find it. The central theme tieing both those developments was the ability for people to use the architecture built by digital corporations to quickly spread misinformation unopposed. People receive the information in isolation, they don't get it side-by-side with other views. People engineering the spread of misinformation know it's not a fair contest, that's why it is so effective.

And that's the point being missed by people who say keep the content up and let bad ideas be exposed by better arguments, the problem is that the ideas aren't being opposed or presented in a robust way. Hosts like Brian Rose and others for instance interview in a way that don't challenge their controversial guests, instead they add credibility to their guests. And because we are thinking of these characters as individuals expressing themselves and exchanging their personal views, people are distracted from the fact that they are businesses operating a money making scheme. And they are only able to do that on this scale because they can use other corporate infrastructure for free.