I completely agree, ISO standards should be publicly available. Ever tried to look up the reference for ISO 8601 formatted dates? Or maybe the list of ISO 3166 Country codes? This data should be available, period.
The value of standards is in their adoption. ISO obstructs adoption of standards by paywalling them, making it impractical for millions of hobbyist programmers to access to them and be able to even understand what the standard is.