alt Hacker News> allows unlimited rail travel within one participating country, excluding the holder’s country of residence
One of the things that always bothered me because it's such an arbitrary rule and has hugely different effects for people from different countries. Like, people from Switzerland or Belgium can easily move around all over the place after a short domestic trip. For a few lucky fellers from Lichtenstein or Luxemburg the rule is practically non-existent on account of the small sizes of their countries, whereas someone from eastern France has to pay for a long-distance ticket across all of France if they want to explore the western part of Europe, and all they get is Spain and Portugal (and Andorra—do they have a train line?) with no way to visit Scandinavia, Italy, Belgium, the Netherlands, Austria, Czechia, Slovenia or Germany without having to pay for a cross-country trip through France a second time.
Also the age limitation for European citizens whereas non-Europeans have no such limit.
I’d argue that most residents would likely have access to better offers locally. As for the age limit, I think it just lets you get a cheaper inter-rail, which is subsidized by the DiscoverEU. AFAIK, you can always buy a full interrail pass for all countries. And yes, non eu people can buy eurail.: but that one is much more expensive than the equivalent interrail, I think. Maybe I’m wrong about the last one tho