If you deploy to app stores you have a slow deployment process and there is not much you can do about it.
I could be wrong, but I think some folks would want their other clients -- even their server -- retrieving that value from that one single source. So when you roll an Android app, you'd also want to implement HTTP + caching... And basically you're on the path to building your own Configly.
In my GraphQL api I have a resolver called appConfig. That enables me to fetch the config I need for a screen in the same request as the data and to reuse any caching/offline/http logic the app already has. Zero added latency. No service can beat that, but then it‘s also just me editing postgres to change the config.