Data regions like these offer no protection, it’s just a feel-good marketing term with no legal basis. Source: I work in this business with multinationals with a similar footprint and we have paid actual lawyers to look at it.

The only thing that unfortunately matters here is that Fastmail has a US incorporation.

Fastmail even writes as such:

> 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.