How very sad, I've particularly liked the new paid version which has also given me operational updates on my U2 flights as well as all the Amadeus-hosted bookings. If this is due to GDPR, I'm sure they could have found a way to accommodate it, but I guess it was more effort than Amadeus wished to make.
Chris, I can only add to the thanks expressed by others, your efforts have given much peace of mind to those of us who fly a little (or a lot). Good luck with the next venture.