Servers, wasn’t probably the right choice. But is there any alternatives when iOS or Android pulls us from their stores, like they have done with Parlor.
You may not want to post, just wondering.
For Android you don’t have to use the Google or Amazon app stores to install apps.
It is somewhat harder for iOS, but there are also some options.
You might have a bigger issue in case Amazon pulls the plug on the PractiScore web site. Though the apps will continue to work as they don’t really need the internet.