It stopped working for activities after May 31. No changes were made on my end. Sure, you could crop the rides, but that's not the point. I could make them all private if I went into each activity and marked it as such, which is less of a pain that cropping. When privacy is important to you, you count on it to work.
Since Strava does not yet support Bluetooth, and only plans so far to support Bluetooth 4, it really has dwindling value for me (my device only goes to 2.1).
Plenty of other apps out there to accomplish the same thing. I keep duplicate copies in Endomondo and will be using that, was just giving a heads up to those who also might value privacy.