Have they shut down text messaging, phone calls, group messaging, all the encrypted messaging apps?
Do the tech companies control postal mail, letters to the editor, and printing presses?
Of course not. You are looking for others to give you a platform to reach a wide audience. There are many. But no platform requires people to publish you. You have lost being able to yell in a public square, temporarily, due to public safety, but you haven't lost the ability to transmit speech that would have been acceptable in the public square.
So so so tired of these false equivalencies, and an unwillingness to engage with the type of speech that results in this. Normal, political speech is just fine. Incitement to violence, no.
Hell, AWS still hosts the publication that posted Bezos' dick pics! These shutdowns are not some sort of political censorship, these shutdowns are the natural result of speech that societies have determined not to be free.