While I do think things defense spending matters I don't think it is what makes (or made) the difference. Look at countries like Germany, France or South Korea. Arguably they have some of the best education and industries in the world but they don't have an outsized number of new tech companies. That is because most of the time you aren't inventing technology (because that is too hard) but trying distribute or commercialize technology that mostly exists.

Silicon Valley is of course where many things in computing were invented but it is more importantly where business machines became home computers. And in the end that is were most of the graphics cards, operating systems, network switches, software applications and services comes from. Sweden didn't invent many computers or operating systems but it was ready to distribute the next thing once it became available. Just like many good synths and samplers came from Japan but many of the big electronic music artists are from the US, the UK or Sweden.