Most users care more about contact discovery than privacy so it makes sense for them to implement it and unlike Signal, it uses #xmpp so everyone has the freedom to use any other app that doesn't require a phone number and you are still able communicate with everyone on Prav.
How do you feel about registering in XMPP by phone number?
Recently, the Prav app was released in F-droid. In this application, registration is by phone number....