Remember that it cost a small rent to get this subscription until the 9€ experiment. Flat fee national transport, I don't remember the exact price but it's multiple hundreds a month in both the Netherlands (NS altijd/trein vrij) and Germany (Bahnkarte 100). Even my local subscription to go ~10km between two cities in Germany (NRW) cost 90€ a month until that experiment

A nationwide subscription for 60 euros is a steal, even when the long distance trains are excluded