Earlier quoted context omitted.
The argument is that WA always told us that they wouldn't share our data. This was a reason people signed up, you can't just "Oops we did it anyway" on so many people. At least not on People who have a government with their best interest in mind.
Is there legal precedent for "sharing" when the only entity you're providing the data to is your owner? Presumably if I bought WhatsApp, I would legally be allowed to query some database for someone's phone number if I so chose because I now own the database.
You might own the database, but you will never own the personal data that is stored in it. And in France (and in the near future the whole EU with GDPR) this personal data has a specific set of allowed uses (explicit or implicit when the user provided the data) attached to it, that you cannot change without asking the owner of the data (the user).
So you own the database, but you cannot use the personal data inside for purposes that were not allowed by the user when they provided it.