I don't agree with shutting parler off, and I despise Amazon, but I will defend amazon here. If you believe in property right, Parler ran on AWS's servers and I am pretty sure the ToS probably states they have the right to terminate the service. I am also extremely far left.

The best solution would be to run your own infrastructure. If your gonna piggy back off someone else's infrastructure, you have to play by their rules rather or not you like it.

Amazon even produce documents over months prior to them shutting off the services of concern and willingness to work with them to resolve them. Parler chose not to respond.