They have EU servers now.
https://www.fastmail.com/blog/fastmail-offers-eu-data-region...
https://www.fastmail.com/blog/fastmail-offers-eu-data-region...
> If what you need is a guarantee that your data remains only in the EU, we don’t have that, and we’d rather tell you directly than let you assume otherwise.
Vouched, no idea why this comment was dead.