Exactly, they have to obey the law of the land. If the limousines in Sweden are supposed to charge by time, then do that. Change your app to charge by time in that particular country.
It's not really about limo v not limo, it's really the other way around: you can charge either for time only or for time + distance, if you charge for time + distance you need a tamper-proof meter.
Time-based is mostly used by limousine services and time+distance for "regular" taxis for obvious reasons (a limo tends to be rented for a long time but not to move far, the opposite is true of regular taxis) but nothing prevents a limo service from charging for time+distance (besides looking cheap) and nothing prevents "regular" cabs from charging for time only.
