Proud dutchie here! I was wondering this morning whether they were going to migrate away from GH. Really glad that they did.
I remember applying for a job (at some weird company) to be put up as an open-source contributor for the dutch government last year. The idea was that I was going to build on top of MuleSoft stuff. They ghosted me a day later, despite me having already done these things for the client they needed me for. I would advise anyone that is looking for OS contributors to not out-source them through companies, as the models don't really align.
Nowadays I'm communicating with people in Utrecht to get partijgedrag to a newer level (the current one is kind of weak). I would love to build some tooling on top of our government APIs, as well. I don't think people realize how much internal tooling is being built with the idea to release them to the public. It's really cool to see.
One of the projects I work on, OWF, has great engagement with our open source efforts from Dutch companies and NGOs.
NLnet is also a great Dutch initiative. It's great to see that smaller, more nimble countries are leading the way in Open Source and digital independence.