Signal is the world’s most widely used truly private messaging app, and our cryptographic technologies provide extra layers of privacy beyond the Signal app itself. Since launching in 2013, the Signal Protocol—our end-to-end encryption technology—has become the de facto standard for private commu...
I think just like Proton provides free services for the greater good, Signal should do something similar. Even special emojis works well IMO. They give you a badge at least