I assume it’s a mix of cheap Hetzner/OVH, a bigger inclination for decentralisation and privacy, and an early adopter mindset.
They lead many tech stats per capita. Another example is the amount of French and German wikipedia pages, patents, research, internet penetration, renewable energy …
A shame that the focus on car manufacturing for so long cannibalised the software business. I think it could have been a software powerhouse, but was/is not focussing at all on it outside of some shining outliers.