A message in a bottle is easier to use. Also, the maintenance cost is negligible, since the system is powered by renewable wave energy. The only downside is the lag, which can vary from a few days to several centuries.
I can't fathom how they bought a good app, put a dev "team" on it for 7 years, and still don't have half the features some neckbeards in their mom's basements without access to the backeng still managed to put into their apps.