https://www.blobstreaming.org/signal-messenger-using-signal-will-soon-cost-50-million-a-year/ > Additionally, Signal allocates $6 million annually to telecommunications companies for SMS messages, utilized to send registration codes for new Signal accounts. This expense has escalated due to rising charges by telecommunications firms, compensating for the global decline in SMS usage. Despite SMS being evidently ridiculously expensive at scale, we seem to be completely unable to shake it as an authentication and verification method. This displeases the rqsd.