Roku isn't the one stopping it from working. The app developers (usually the service itself, or a developer contracted by the service) determine where the various apps work. As for why the developers don't include your location, you'd have to ask them.
If you're looking for Now TV, why aren't you looking at the Now TV box or Stick? Does it now support the other apps you're seeking?
Basil
https://www.basilsblog.com/
Roku Ultra (4660)
Apple TV (5th gen), TiVo
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Roku boxes from every generation.
Apple TV (2nd, 3rd, 4th gen)