This is not about payments or crypto, eID is the electronic identity card system which also allows you to "Sign in with eID" (like Sign in with Apple) on government websites and organizations that require your real identity to provide service.
It starts with the government's own services but random third party operators are not ruled out, this is a fundamental building block for an "internet access pass" for all but the most niche sites like this one.
Right now Facebook only asks for ID in case of obvious fake names, because it's a huge barrier to ask people to send theirs just to create an account. This should remain a barrier.