I think you are factually wrong: Skype, Spotify, Revolut, Zendesk, Transferwise... There are quite many European unicorns too (less though than US and Chinese companies) which are operating as SaaS. Some of them got acquired or re-based to other countries though

Didn’t Zendesk stab a pentester recently?

https://news.ycombinator.com/item?id=41818459

Can confirm, got stabbed by a spammer on Skype yesterday.