El Salvador is training ground for the digital id/$/€; i wouldn't be surprised if it was done for that specific reason, to test infrastructure/prove a point
Digital ID has been used for a long time in many countries (see things like estonias ids or swedens bankid/freja or any of the similar things in other EU countries and the rest of the world). Digital currency has also been around forever.
What El Salvador is trying to try is making decentralized currency part of an inherently centralized system (government identity and banking).
I don't think it'll work but don't confuse their thing with the generally accepted good thing of digital id's (being able to prove your identity to sensitive services like tax authorities, banks, etc.) or digital money (which is what we all have except when using actual cash and coins).
