Yes this is better than upload the entire photo. Just like virus scan can be done entirely on device, can flagging be local?. If homeomorphic encryption allows similarity matching, does not seem entirely private. Can people be matched?
>> "The caveat to this rule, of course, is that architectural differences are hard to overcome. Shared nothing databases are at a disadvantage vs shared disk, and it took Redshift many years to switch to a primarily shared disk architecture. Lakehouses that rely on persisting metadata to an object store will have a hard time with rapid updates; this is built into the model."