YouTube was the most important platform for reaching The Youth and also uniquely compatible with monetization, allowing independent political/intellectual entrepreneurs to make a career.
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The most important platform to be closed off 2017-2019 was YouTube. Before 2017, YouTube was a very open platform, with easy monetization and almost no moderation of legal content. By the end of 2019, thoughtcrime (anything to the right of Ben Shapiro) was thoroughly purged.
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In March 2017, several news organizations (The Times of London, the Guardian, WSJ) published coordinated articles about ads appearing next to "problematic" content on YouTube. This led to the British government summoning Google to explain and an advertiser boycott.
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[as an aside, no one sane believes that an ad appearing next to a YouTube video implies the company behind that ad endorses or knows about the content of the video; this was 100% astroturf. No one knew or complained until the news articles hit]
Google then began restricting ads/monetization to large accounts that had been manually reviewed, and greatly expanded the scope of its hate speech policy (for instance, banning insults "associated with marginalization" - no points for guessing who defines that).
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YouTube participated in the August 2018 deplatforming of Alex Jones (along with Apple, Facebook, Spotify, LinkedIn, Pinterest, Vimeo, and Twitter), permanently banning from the site. Jones' deplatforming was the start of a slippery slope.
YouTube expanded to more than 10,000 moderators in 2018. More than 90% of removed videos were seen by fewer than ten people.
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