[zaggynl]

Good question! I assumed it was US only but things have changed a while back after it becoming popular it seems. Going by https://signal.org/blog/signal-is-expensive/

>Because everything in Signal is end-to-end encrypted, we can rent server infrastructure from a variety of providers like Amazon AWS, Google Compute Engine, Microsoft Azure, and others while ensuring that your messages and calls remain private and secure.

[gruez]

Your source doesn't support your claim. The exact snippet you quoted, interpreted strictly, only means they have the option to host it across providers, not that they actually do so. It also doesn't say anything about where it's hosted. It can be hosted in AWS, GCP, and azure, but all in the US, for instance.