Their remedy was the First Amendment, guaranteeing all of us freedom of speech and association and barring government censorship. They had no way of anticipating that tech companies would grow more powerful than governments and have the monopolistic ability to suppress or cancel political viewpoints.
On the one hand, it is concerning that a company like Twitter controls access to so much public discourse nowadays.
On the other hand, I wonder how is this really very different from the situation just a few years ago, where large companies (hello, News Limited!) owned newspapers, radio stations, television stations and even movie studios? There was absolutely no right of access then. Murdoch and his minions decided what news to publish, and who was allowed to provide comments on the news of the day. You could write all the letters you liked to the editor, but there was no guarantee at all that any of your letters would be published.
Back then - just a decade or two ago - the only way to get your voice heard was to print and hand out flyers, or to stand on a box at speaker's corner and shout at passers-by.
Nowadays, you can start a blog, get a page on Medium or Substack, make a YouTube channel, join Tik Tok, or get yourself heard in a myriad of other ways.
Yes, Twitter and other such companies are influential but I think that people often ignore just how many different ways individuals can now make themselves heard, compared to just a few short years ago. When talking about tech companies, many people also seem to forget - perhaps deliberately - just how much power and influence traditional media companies had (and still have).