A good point
《That's still fewer than 2 apps per island. How many software developers do they have on each island?》
I would wonder how much of this sprawl to provide "local" employment (to the governor's nephew) and less cynically to address purely local problems or a local solution to common problems not being addressed more widely.
Knocking up a quick and dirty app using a high level framework to implement a local government program that will only last a year or so may well be much more cost efficient than waiting for the central government IT to get round to implementing the function in their one "ring-of-power" app which will typically be delivered long after it is no longer needed and millions overbudget.
Shadow IT on steroids ;) - With the coming advent of AI/LLM and low/no code user generated applications, shadow IT seems to have faded as a clear and present danger from security theatre's repertoire.
While the President's is probably an ambit claim, the development of a central capability to deliver government service would be wise to prioritize those that have the greatest benefit, shortest delivery time, largest user base and least cost.
A relatively simple national electronic identity and licensing system might be progressively rolled out with immediate benefit to users with later services leveraged off the identity management foundations.
I would assume any apps would be initially for a android mobile/cellphones as these are far less expensive than apple's devices and likely more common by many factors.
I don't know how quickly phones turn over in these nations but if signicantly slower than in EU/US etc addressing the range of android versions might be a challenge. The Covid-19 check-in app in Q/AU didn't work on my (older)Samsung phone because it was one point version (x.1 v x.2) too low and no upgrades (The app just opened a url, posting the date/time, user's location number, numerical identity - not rocket science.)
I wouldn't mind being pleasantly surprise by a public sector software success from this nation. India seems to have made significant progress in some of these areas which given India's much larger scale and unique challenges I would been rather sceptical of any success.