They’re not wrong in saying that that’s the law. Maybe as you say it’s not law in traditional sense but the requirements are quite clear.

> You may register a .eu, .ею or .ευ domain name if you fulfil the following criteria:

> You represent an organisation established in one of the European Union Member States; or Iceland, Liechtenstein or Norway. You are an individual residing in one of the European Union Member States, Iceland, Liechtenstein, or Norway, or a citizen of one of the European Union Member States, Iceland, Liechtenstein, or Norway (as of 2 August 2021).

It's EU law, which by definition makes it 'transnational' law.

There's nothing which requires the EU to impose that law, but it is law nevertheless.

I apologize if my comment was pedantic as we don't disagree. The parent quote is "If you are not a member of a certain country or economic zone, you cannot get and keep that zone's exclusive domains. Thats law." While the context is the EU, the parent made a claim larger than the EU, which is not correct.

It would be different if the parent had written "If you are not a member of the EU. . ." but that was not what was written.

Likewise, an EU law that governs only EU assets isn't transnational. For example, Poland doesn't have eligibility criteria [0] but French ccTLDs like .pm do [1]. As I read the restriction text I detect a touch of the spite referred to elsewhere as it has exceptions for other non-EU-member European countries: "Switzerland, Norway, Iceland, and Liechtenstein"

0. https://www.wipo.int/amc/en/domains/cctld/pl/index.html

1. https://www.wipo.int/amc/en/domains/cctld/pm/index.html

Those are the single market countries, it’s not unusual to see those four as exceptions, but I take your point, OP could have been more precise.

If there is an Eu rule for something, its the Eu law. Regulations work like that.