If nothing leaves the device so why to scan it at all? This is what proves your statement about compatibility of scanning and e2ee to be wrong.

Banks are probably the most Orwellian surveillance apparatus of all. Almost every time I read an arrest warrant there is a whole section where banking records are used to damn someone. The equivalent level of banking privacy to graphene is roughly walking in to the teller to withdraw a few thousand cash once a month and then paying literally everything with that (or an anonymized crypto).