if a messenger is truly 0 trust end to end encryption, it doesn’t matter who owns the servers or the legal protections of data because they won’t have any data anyway. that’s why signal is so good, when they get subpoenaed the only information that they actually have is the last connection and message sent unix times or something. still secure regardless of being in the US and being run on centralized Amazon, google, and cloudflare servers.
Then the jurisdiction of software development matters. Don’t want a back door being forced into an update by the FBI.