Probably just to try to make Garmin's product less useful in the short term while the case drags out. Or as a way to get Garmin to acquire them. Strava basically seems to have bought up some competitors that were failing and they have been on the way downhill. So at this stage usually these companies start cost cutting and using any means necessary to increase their perceived value for sale. This gives Garmin an incentive to buy them as that would end the lawsuit and they'd then acquire some additional defensive patents.