Not to mention that this is a pretty good way to fund Signal. That's always been a challenge with Open Source projects as not enough people want to donate. On that note, a lot of companies will do donation matching and just saying, that's one way you could go about it if you feel inclined. For an app I use every day, I don't mind throwing them some beer money (and having work pitch in too). I get more utility out of it than my Spotify subscription