Not only this, the site owner lost the data too. I know we have more features in new sites, but the site owner should take care of their clients' data or lose trust.
I don't recall anything about them losing Data. They were able to confirm balances and port those over to the new acounts created on their new platfrorm. They have given their reasons for making their business decision as to why they moved over to a new platform. Short answer is user experience and a custm build for total control to provide the service they envision.