I agree in the general case for more complex apps. Firebase for example.

In this case, it seems the content is the real value rather than the app itself. Meaning, the app doesn't have too many roots that can't be uplifted. The main pieces I see are:

  - registering as 1st party app ( a couple months with redtape )
  - used a standard database ( shouldn't use more than a year )
  - used standard auth ( should take less than a year )
  - getting an approved domain name and real estate ( technically it's not a big of a change. it could be political, which brings me back to my original commentary)

In the worst case, it would take 2-3 years even at Google pace to rewrite the app. It's been 7 years.