We use it for statistics aggregation purposes (like how often the actual installation of program is being run, whether it continues to be in use in the full 1-month upgrade period etc.). There is no private information sent to anywhere. We cannot identify you or any of your details from the uuid or whatever. You will find same/similar with lots (if not most) of free/trial software today.
There is no privacy problem. We know that this particular instance is being used like *this or that* (once only, every day, for 2 weeks, for 3 weeks, whatever). Not where it is runnning (ip or whatever) and not who runs it (obviously as it is not registered).