Try https://getsession.org/ https://getsession.org/ which doesn't require phone numbers and is a fork of signal. It is still very early stage and discoverabili

Try https://getsession.org/ https://getsession.org/ which doesn't require phone numbers and is a fork of signal. It is still very early stage and discoverability/groups are half backed (can't add people to group after creating it with 10 being the limit) but it solves the centralisation problem of signal.