Not the first time this has happened <https://www.theregister.com/2021/06/18/schematron_standard_paywall/>: a group volunteers to create an open standard, giving freely of their time, get it widely adopted, hand it over to a standards body like ISO to make it “official”, and the latter starts charging for copies of the spec. Note this response from ISO: "Unfortunately, the ISO Central Secretariat does not provide free copies of standards. All ISO Publications derive from the work and contributions of ISO and ISO Members that contain intellectual property of demonstrable economic value.” And how much did ISO pay those contributors for that “intellectual property”? Not a penny.