You can download and read the entire memo here. If that is too great a time investment, then read Allum Bokhari's introduction and summary here, including:
An internal company briefing produced by Google and leaked exclusively to Breitbart News argues that due to a variety of factors, including the election of President Trump, the "American tradition" of free speech on the internet is no longer viable. ...
[T]he 85-page briefing, titled "The Good Censor," admits that Google and other tech platforms now "control the majority of online conversations" and have undertaken a "shift towards censorship" in response to unwelcome political events around the world.
The briefing labels the ideal of unfettered free speech on the internet a "utopian narrative" that has been "undermined" by recent global events as well as "bad behavior" on the part of users. ...
It acknowledges that major tech platforms, including Google, Facebook and Twitter initially promised free speech to consumers. "This free speech ideal was instilled in the DNA of the Silicon Valley startups that now control the majority of our online conversations," says the document.
The briefing argues that Google, Facebook, YouTube and Twitter are caught between two incompatible positions, the "unmediated marketplace of ideas" vs. "well-ordered spaces for safety and civility."