“When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on.”
It’s certainly not a scam, and it is a reliable, private messaging app, don’t get me wrong. It’s just not decentralized/federated, and that’s the issue for me.