"executives at YouTube began mulling, once again, the problem of online speech. On grounds of freedom of expression and ideological neutrality, the platform has long allowed users to upload videos endorsing noxious ideas, from conspiracy theories to neo-Nazism."

They're not "mulling" anything. YouTube, and Google's search engine, are engaging in effective censorship of non-mainstream political content (both left and right wing, by the way) - for a couple of years now.

See this report already in 2017: https://www.wsws.org/en/articles/2017/07/27/goog-j27.html

and everyone knows how for, what is it now, a couple of years or so, YouTube pushes mainstream news media items when you watch over political content - videos which used to have almost no views, and are now artificially massively popular.