Generally, I feel like in Europe people move a lot, since it's quite easy to live and work in another country within EU.
However, from my experience, most of the people who move are doing it for two reasons: work (more money, better economy) or spouse/family.
But do people move just for fun? For example, they like weather in Spain (not talking about retired people who move there), or they like how French sounds so they move to France or they like the vibe in, I don't know, Helsinki so they move? And how often would you say that happens?
From the people around me, I know a lot of people who left, but only maybe 1-2 who left for reasons other than work or a spouse.