Many years ago I read how Facebook was developing technology where they would hash content before encrypting, checking against a list and then notifying. Curren

Many years ago I read how Facebook was developing technology where they would hash content before encrypting, checking against a list and then notifying. Current csam tech basically. That time I understood the whole e2e is for outsiders. Essentially, you cant have this data, only we do. First dibs and all.