Did so years ago. Everybody uses it from my family and friends. I’ve had a very active group chat there for eight years with friends. My mom uses it actively, even calls me using Signal. My partner knows it is the best chat app and actively uses it.
I just asked ages ago for everybody to switch to signal, they valuated the features and for a group chat automatically deleted messages and strong encryption were really interesting for everybody. Now we can shoot shit in a group chat without needing to worry that the logs are stored somewhere forever.