I'm not talking about Apple, I'm saying in general technology has already been deployed to make what you're describing possible. So where's the evidence of abuse?

No vendors are snooping your phone/computer browser cache, so this attack vector does not yet exist. Apple is building it.

> No vendors are snooping your phone/computer browser cache

a) That you know of b) Apple won't be doing this either

> Apple is building it.

No, they aren't.