Earlier quoted context omitted.
Individual countries within the EU have their own regulators who make their own enforcement decisions. The EU isn't a super-state and EU law isn't applied by some overarching entity. On a technical level, each country ratifies and applies their own laws in their own ways. Given this, other countries could act on this too, but it's the French regulator who has chosen to do so.
> The EU isn't a super-state and EU law isn't applied by some overarching entity Yes-and-no: the EU Commission serves as the "executive branch" ( Americanisms... ) of the EU, and while the EU isn't a true federal superstate union yet , but there's enough similarities that the EU Commission probably does 80% of the work it would be doing if the EU were. While the majority of EU directives are enforced by member states…
That only prosecutes the misuse of EU funds (and perhaps the EU VAT border regime?) and even then only with cooperation with local prosecutors. In addition, the EU prosecutors are from the participating member states - several EU members are not yet participating.
> EU Commission probably does 80% of the work it would be doing if the EU were.
It's very far from that; notably health-and-safety enforcement is largely in the jurisdiction of members states.