Originally, chance. Over a decade ago I was traveling country to country a year at a time, and had never lived somewhere so far north. I booked a ticket and landed with a suitcase knowing nothing about it (no exaggeration, I had no idea.)
Once there I realised it's an amazing place. Lovely people. Peaceful and quiet. Good rule of law and stability combined with kindness (you can trust the police here.) High tech. Beautiful nature. Very clean air. Lots of forest. Big enough to have a big city; small-town living if you want.
It's very business-friendly and I started a company here. Then, married an Estonian, so I guess I'm staying here now :)