That's what struck me too about the article: tens of thousands of newly arrived tech workers complaining about the lack of a tech scene and moving. They're treating "scene" as something that should just be there for them to consume, rather than something that they could potentially create. They might look at each other and say "Hey, we are the tech scene, all it takes is some socializing."
So you propose they all start businesses in the place they've realized has a much weaker tech scene than they imagined when they came with no intention of doing that? Moving seems smarter.
Being the first in the world to offer up some product or service you've come up with is not the only path to entrepreneurship. In fact, on a risk-adjusted expected-value basis, it may not even be a particularly smart way of going about getting there.
An alternative is to take something that has been tried and tested elsewhere that's not easy to move from place to place, and just go to a place where there's high potential demand and not yet any supply, and offer it there.
The picture in my mind is: There's this guy dreaming about becoming a billionaire by setting up "tinder for pets", but now he can't do that. His problems are: There are no high-profile speakers at local tech conferences, internet connections at cafes suck, and grocery stores do not carry his favourite caffeinated beverage.
So, why not do that? Invite some high-profile speakers to local tech conferences. Partner with local cafes to provide better internet. Set up a distribution channel for a caffeinated beverage. If that's the situation he's in, there's a pretty good chance that any of that is probably a more useful thing to do than "tinder for pets".
Mass migrations are ripe with economic opportunity, it's just a different kind of economic opportunity.
