Signal is a secure messenger that is widely touted as one of the best options. This Signal review shows you the pros and cons.
"When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on."
This isn't an ad, I wasn't paid for this post. Just to clear the air: fuck facebook, fuck elon musk and twitter, fuck anyone who thinks this is a paid advertisement. I wish I was paid for this shit, I just wanted to spread the word. Thank you. ๐ ๐
It was almost certainly to reduce operating costs, but I doubt they lost a significant number of users over it. The vast majority of their users are in countries where SMS isn't really used anymore.
They pretty much straight up said keeping up with SMS on all the different phones and trying to make sure it works, testing, debugging, etc, they were spending a ton of time and effort on something that isn't even secure. The main decision was to keep operating costs down