Meta’s new app has been listed in the US and the UK, but has no foreseeable launch date in the EU yet as the company worries about the bloc’s privacy regulations.
Threads isn’t yet running in the EU - and it might never run, as the bloc has stricter privacy rules than most other countries, and it has given Meta a few headaches to cope with in recent years. It’s not the EU that blocked the launch of the app, rather it’s Meta who’s being preemptively careful.
Basically Meta is unsure if EU privacy law will allow them to keep functioning so they just decided to not launch there