being something that involves investor money, you should do things that do not violate the law
This, otherwise everybody is going to lose eventually. if anybody remembers what happened to the Redbook admins in SF you should be careful considering they're both doing serious time right now. Incorporating 'offshore' is meaningless if you are actively promoting within the US or taking payments you can still get extradited, esp if you're giving interviews, or are at all political. One of the main reasons Redbook went down is they became political/advocacy, if you're doing something illegal don't get involved in politics, try to avoid centralizing payments and never give interviews to the media, just grow your shady app slowly it will get popular, no need to force it by rubbing your illegal service in the face of cops and politicians with high profile interviews, they hate that and like to make 'examples' like the Redbook people. The media isn't your friend, you should treat them like late stage cancer because after every interview they go run to the nearest politician "What are you going to do about this blatant illegal app? Your comment please Senator" and this elevates you to having significant resources aimed in your direction.