I see several issues...
Amazon is a private company so it can do what it likes, for one.
Are they and these other tech giants preventing people from setting up new host sites? Everything is so intertwined these days.
Should anyone be forced to host entities calling for/promoting insurgency and political overthrow in the name of free speech? Parler, apparently removed Lin Wood's posts calling for Pence to be executed. Good? Bad? When stuff like that gains enough of a following to push people to act, like we saw this past week, and we have a President openly supporting it...what then?