It takes more effort to make internal code FOSS (i.e. upstreaming changes, protecting internal parts, etc.) - and often very few other people use it or contribute back anyway.

I think it'd make more sense as part of a unified effort - like all EU countries agreeing to provide one digital ID service. But that itself is a much bigger issue due to differing levels of digital services, bureaucracy, etc.

I still support it though, and donate to FSF Europe every year with my company donation.