All this, plus the well-established legal notion of “informed consent”. If I rent a megaphone from a shop it would be utterly unreasonable for that shop to tell everyone I’d bought a megaphone - I wasn’t informed and wouldn’t reasonably assume that’s what they would do, so I couldn’t consent - but if I walk around using that megaphone to shout at people it would similarly be utterly unreasonable to argue that the shop is responsible for keeping my bellowings private.
All this, plus the well-established legal notion of “informed consent”. If I rent a megaphone from a shop it would be utterly unreasonable for that shop to tell everyone I’d bought a megaphone - I wasn’t informed and wouldn’t reasonably assume that’s what they would do, so I couldn’t consent - but if I walk around using that megaphone to shout at people it would similarly be utterly unreasonable to argue that the shop is responsible for keeping my bellowings private.