> Servers: $2.9 million dollars per year.
> Registration Fees: $6 million dollars per year.
> Total Bandwidth: $2.8 million dollars per year.
> Additional Services: $700,000 dollars per year.
Signal pays more for delivering verification SMS during sign-up, than for all other infrastructure (except traffic) combined. Wow, that sounds excessive.
But hey, they still want your whole address book, and announce you're on signal to everyone else on signal.
The whole "secure" thing is a joke. Its all linked to your identity via your phone#.
I do agree about being linked to your phone number - doing it that way means not considering a lot of people's valid threat models. They are working on moving to usernames, though. It's in beta now.
It doesn't say how it works. If Alice's phone can tell whether her contact Bob uses Signal without Alice and Bob doing any sort of a priori cryptographic exchange, why couldn't Signal itself do whatever Alice's phone is doing?