No mainstream messenger has ever done a better job with metadata than Signal. It took Signal several years after launch just to get user profiles with names and stuff, purely because of privacy concerns. Read the blog post they wrote about GIF sharing to get a sense of how seriously they take this, then compare how their features work to other mainstream messengers.
There is one privacy issue people put pressure on Signal about, and that's the use of phone numbers. Apart from that, Signal has always led the field on privacy issues.
There is one privacy issue people put pressure on Signal about, and that's the use of phone numbers. Apart from that, Signal has always led the field on privacy issues.