Indeed! While we are not alarmists or prone to seeing bad actors behind every tree, we do believe peoples’ data is their own, no different than the belongings in their home. From our standpoint, what happens with that data should be up to the owner.
User-controlled data is a big reason we advocate local syncs first. (There are sound technical reasons we advocate it too, but we’re waxing philosophically now 
) I like to sum it up this way: Your data synced only on your network only to your devices.
If someone chooses to put that data in the hands of others, i.e., via syncing to a remote server like Dropbox, that is their choice to make. And we provide the encryption key option to make that sync data pretty much useless to anyone but the owner.