Why European data changes the design.
The GDPR can apply to a company established outside the EU when it offers goods or services to people in the EU, or monitors their behavior there (GDPR, Article 3(2)). An AI feature that reads customer messages, documents or records is then a processing operation like any other: it needs a purpose, a legal basis, a known chain of processors and a retention rule.
The EU AI Act can also apply to providers and deployers established outside the Union when the output of an AI system is used in the EU (AI Act, Article 2). Whether and how it applies depends on the system and its use; that assessment belongs to your legal counsel. My role is to make the technical choices visible and documented, so they can be assessed.