You can hold private companies accountable via secondary boycott. It's more complicated but it can be done.

Correct. Also, you won’t be dragged to a keyboard connected to a computer logged in to Twitter at gunpoint, but you sure will be dragged to court to face a judge at gunpoint. There are different standards of accountability that match the standards of compulsion and violence.

'Are held' and 'can be done' are obscenely different to conflate them.