Incorporating outside of Sweden allows big companies to enjoy tax benefits and then hire Engineers from Sweden at an average of 50,000USD to 68,0000USD (these numbers can easily be found on Google).
They get lower taxes, a cheap labor pool, and the company isn't limited through draconian taxes and regulations, it only has to deal with it at a satellite office. It's a win-win.
Now show me a company that's large, started in Sweden, and is still in Sweden many years later.