They have your problem now and already address it. It isn't unique to retargeting. They lose customers. Ad networks lose websites. Walled gardens lose users

They have your problem now and already address it. It isn't unique to retargeting. They lose customers. Ad networks lose websites. Walled gardens lose users. That's why you don't see promoted dildos on Amazon, Forbes, and Facebook even now - and why your nightmare scenario is just a bad daydream about rubber cocks.