It's so easy to get into New Zealand, that it's used as a stepping stone for Australia. Spend 2 years in NZ, get PR, 2 more years get Citizenship. Move to Australia without needing a visa to live/work in Australia. You may as well just hand out Citizenship on arrival.

The government isn't doing anything to make people want to come to NZ to start a business, so New Zealanders literally just pack up and move to the UK / Australia.