To be fair, since there is no remote attestation possible for the Signal servers, and you realistically can't run one yourself, you only have their word that they don't store any of that information.
This is similar guarantees that a lot of other chat and VPN companies offer. Personally I would consider any information given out to a company non-secret, especially to those operating outside my jurisdiction.
This is similar guarantees that a lot of other chat and VPN companies offer. Personally I would consider any information given out to a company non-secret, especially to those operating outside my jurisdiction.