Although I have disabled "Desktop App Usage Information" in my Adobe account, LR continues to send data to the Adobe servers (hosted at Amazon) each time I'm doing something in LR. I have traced this with a network monitor. The transmission of data is permanent.
I'm not paranoïd about this but I'd prefer to have LR spending time processing my images instead of consuming CPU and bandwidth to send data to Adobe. So my choice has to be taken into account. Currently, LR merely ignores this Security and Privacy setting in my Adobe account.