> Of course a chargeback, the final legal method through which you have issues redressed, is a valid reason to deny you further access to a private company's platform.

I would completely disagree. It depends on whether the chargeback was justified. If a company illegally charges a user and the user merely declines to pay it, the subsequent blackballing (and damages associated with it) are damages of and resulting from the original crime / tort. It begins to smell like extortion.