That's an interesting argument, however it probably wouldn't go that far.

Taking it back to retro interpretations, sharing your photo with meta is basically the same as sharing your photo with a print company that takes and processes your negatives. They're acting on your behalf in a limited scope, so sharing with them is the same as you doing it all yourself.

However it maybe comes back into play when that scope isn't limited, as Meta require in their terms of service. It doesn't matter what individuals say to Meta regarding their data, their prohibition is superseded by other users, who agree that they have permission to share other people's information with Meta.

Meta isn't breaking privacy laws - you are.