It's the equivalent of complaining that hotmail sold your private email data to Thunderbird when you used Thunderbird as your desktop email client. No. They didn't, you gave them access to it because that is what connecting the accounts does.
If should be fairly clear to anyone that if you connect accounts you are exposing data between the accounts. The debate about the granularity of permissions is neither here nor there, everyone should have a clear expectation that connecting accounts = sharing lots of data. Unless it is explicitly stated what is excluded the assumption should be that everything is shared.