The tech industry might not be big in comparison to the US, but per capita I would think it is. Sweden's prosperity was built largely on technology, engineering, natural resources and heavy industry. The economy is pretty diversified now, with large fashion, design and bio-medical industries as well. In general, just like you say, the entertainment industries and financial industries are much smaller.
My guess for why there are so many game developers in Sweden: people are free to pursue whatever they want, without much financial pressures. People don't rush through college, because there's no tuition. They're not as pressured to go into high-paying industries because they have less debt to pay off. That combined with early access to computers and internet creates an environment where people pursue their passions, for better or worse.
My guess for why there are so many game developers in Sweden: people are free to pursue whatever they want, without much financial pressures. People don't rush through college, because there's no tuition. They're not as pressured to go into high-paying industries because they have less debt to pay off. That combined with early access to computers and internet creates an environment where people pursue their passions, for better or worse.