Note that 1 to 1 chats are also not encrypted by default. It must be manually enabled - and once enabled you can only access the chat on a single device.
Not really. Censorship is generally used in a general sense, in which a private party can be the one doing the censoring. It doesn't purely apply to the first amendment in the US constitution.
And with sites like Facebook, Twitter, YouTube and others with a large share of the market, it can certainly seem like censorship given how much being blocked or banned hurts your visibility.
For the lazy:
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2008: DuckDuckGo was founded[15] by Gabriel Weinberg,[16][17] an entrepreneur whose previous venture, The Names Database, was acquired by United Online in 2006 for $10 million.
This is most relevant snippet I could find about DDG's founder.