Stockholm is so over-hyped. Yes, there is a lot of engineering culture, but there is so little risk capital available at the bottom is it truly laughable.
Furthermore, I don't see many of these unicorns putting a lot back into the ecosystem in terms of investment, social capital, or outreach.
Sweden's needs her of "Paypal mafia [1], Facebook Mafia [2], Trilogy Mafia, and Dellionaires [3] if this startup startup ecosystem is to really thrive.
[1] - https://en.wikipedia.org/wiki/PayPal_Mafia
[2] - https://www.cbinsights.com/blog/facebook-mafia/
[3] - http://www.barrypopik.com/index.php/new_york_city/entry/dell...
(edit) so more thoughts