They've been obscuring their code for about a year and even then, it's not like Signal has always come out and said "we love the passion our fellow developers have for our commitment to privacy and security". They just let people sell their relatives on that promise and waited until they had a massive userbase to start monetizing their platform.
Thanks for your reply, I just wonder where all this trustworthiness has been coming from for the last 12 months while they've been quietly working on the platform without publishing any changes. It feels like a beta tester for a game being mad that there were lootboxes in the full release of the game when they weren't in the beta. Even if you didn't know they were coming, you had to assume something like it was inevitable given enough traction.