Mandatory military service with a military that has a high weight on technical warfare/superiority is an oft given reason.

Another is network effect. The same way that Silicon Valley has a lot of very successful startups. Once you have a few in a region, it creates a knock on effect.

It inspires people to follow suite. It means there’s more money being pushed around in that area. It means there’s more people looking at developments in that area. Often someone may be lower down in one successful startup and then leave to make their own with the experience of how to do it.