There's nothing particularly Estonian to this - you can buy European digital identity in all EU countries (except Great Britain and Ireland, last I checked). All documents signed by your key are legally as valid as those signed by your hand.
Sadly, it's not used much outside of government services.
Isn't that for citizens and residents of those EU states? This "e-residency" is for anyone in the world: there's 241 nations in the "Your Country" menu.
(which by the way is a few years outdated: e.g. there's no South Sudan, and Libya is still the "Libyan Arab Jamahiriya", which was Qaddafi's name for it).
No, it's the exact same thing (although it appears to be the cheapest in Estonia), it's the exact same EU-wide law. The only difference is they market it for foreigners.
