Maybe you should treat all your users' privacy and data with proper respect, regardless of what country you think they're in.
This is the correct approach.
What if your idea of proper is different then that countries laws?
Be careful with that logic: While prefixes are supposed to be regionally-allocated, they can and DO move around occasionally. You could find yourself in a situation where you are referencing outdated geolocation information, resulting in a potential violation of GDPR.