if we are suddenly thrust into a dark world without internet then the inability to generate biab songs would be the least of our worries

you all make some great points for and against, I agree with them all.
i also work as a developer, building back-end services, and it's never been easier to set up servers using cloud services like AWS. In fact, these days, you don't even need servers, you just deploy your application to the cloud, and pay by the ms of processing time that is used. This kind of thing would be ideal for handling the song generation, creating the audio tracks, and then making them available for streaming.
i was not aware about the mobile app.
the more i think about it, the more attractive a web-browser based interface would be.
i'd be prepared to bet that a lot of people are turned off by the current GUI (see separate discussion about younger people not using the program)....
yeah, of course a good internet connection is a requirement, but that is already the case for many of the critical things we do online these days, and it's pretty much a given.