It’s an antitrust issue, not a free speech issue.
But wait, there's more!
- Monopoly / antitrust
- Free speech
- Sedition / insurrection
- Property rights (of vendors)
- Freedom of association (vendors)
- National security
- Incitement, accountability
Interests and values require balancing. Some may weight more heavily than others.
I bet if someone had started a service similar to Parler but non-political, where people posted massive amounts of death threats and hate speech but directed at people for non-political reasons and that service utterly failed to moderate, Apple and Google and the rest would not have given them two years. They would have been gone in a week.
And more to the point - would AWS and Stripe deplatform them?
8chan and Cloudflare: https://techcrunch.com/2019/08/04/cloudflare-will-stop-servi...
Daily Stormer by Cloudflare: https://blog.cloudflare.com/why-we-terminated-daily-stormer/
In 2007, Verizon blocked a text message campaign from an abortion rights group: https://www.nytimes.com/2007/09/27/us/27verizon.html
Similar kinds of censorship have, realistically, been going on for quite a while. IMO it's the monopolies which are now making it more of a concern. Deal with the anti-trust problem and everyone wins.