If the info in this article is true then the new app should have cost very little (monthly fee $79) and been developed in a matter of weeks. Even if it is not true a directory app with a loyalty module is no big deal even when developed from the source code up.
https://www.10footinvestor.com/investing/big-trouble-in-big-un/
So why has it taken so long and why did BIG pay so much??