Signal is certainly not. It's open source, and verifiably end-to-end encrypted. The only information that they have about you is your phone number, when your account was created, and when you last connected to the service.
Telegram is not so privacy friendly, with a major problem being that it's not end-to-end encrypted by default.
Signal is hostile to third party apps, but there are still third party apps for it, including Molly. If Signal were selling data, Molly devs would have found it.
Signal and Telegram
I'm pretty sure they're selling the data
Signal is certainly not. It's open source, and verifiably end-to-end encrypted. The only information that they have about you is your phone number, when your account was created, and when you last connected to the service.
Telegram is not so privacy friendly, with a major problem being that it's not end-to-end encrypted by default.
Signal is hostile to third party apps, but there are still third party apps for it, including Molly. If Signal were selling data, Molly devs would have found it.