The parent, in a reply to a sibling comment to mine [1]:
> Yes, totally agree. These big companies must be broken up, or treated with a much greater degree of regulation (effectively holding them to the standards that the government is held to, as sole provider of some functions).
I am sympathetic to breaking up big companies (albeit because of a dislike of private consolidations of power, rather than a commitment to freedom of speech). But their alternative proposal is exactly the scenario to which I was referring.