You're comparing a nearly perfectly competitive marketplace (newspapers) with an oligopoly due to network effects (social media). The customer has free choice in the former but very little in the latter.
Ever tried to start a new one? The network effects are real in print media too.
Similarly, major television media has always locked out socialist and communist points of view in the United States.
This idea that only Google suddenly has a point of view in their editing what they allow on the platform seems really strange to me.