Reciprocity laws between UK and USA, and target any assets stored in the UK, or any countries that share reciprocity.

Reciprocity laws between UK and USA.

Reciprocity laws between EU and USA. They can also seize any assets Twitter may have in the EU, or remove access to the website.

EU data protection laws are why many sites changed their how they handle privacy, including storing data in the EU. They also force non-EU online companies to charge an EU tax if customers buy from the EU, and register with the EU to pay that tax to the government.