I think for most people there is a big gulf between information posted to social and their entire email inbox, their credit card details, passwords, etc.

For this kind of tool to be useful it basically has to be able to impersonate you digitally. I know I personally have zero trust for Meta to do this securely and without exploiting me, whereas Google I feel a lot better about here. After all Google has made a business out of safeguarding data with gmail, drive, etc. Same with Microsoft and Apple. Meta, OpenAI, not so much.