Marsh v Alabama found that private owners might not have the ability to refuse protected speech on their publicly accessible property, so it's not so simple as

Marsh v Alabama found that private owners might not have the ability to refuse protected speech on their publicly accessible property, so it's not so simple as just being able to declare they're a private entity and that is that. "In Marsh v. Alabama (1946), the Supreme Court ruled that a privately owned company town could not prohibit individuals from exercising their First Amendment rights to free speech and religion" I'm not saying bluesky is the exact same, but it seems pretty damn similar to the private sidewalk that the Gulf Shipbuilding Corporation privately owned.