The thing is that you're probably never going to be able to get the app published in the App Store or Google Play, right?
They're never going to allow a crypto investment app, at least that's what I would think.
If the app is actually that good and abides by all the government required KYC policies, it can be published in the app stores just like how exchanges are hosted there. I mean if it's really worthy, people wouldn't mind downloading the source files lol
Perhaps someone else could comment on this, since I've personally never released an app, so I'm not completely sure what the review process entails.
It's simple, they don't give a damn as long as you're not directly stealing from people. There are many gambling apps in the market which are run by unlicensed casinos.