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Encrypted SMS and malware scanning
(f-droid.org)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
It's the same story as with PGP encrypted mail. It has existed for decades, is easy to use, but barely anyone does. It's nice that encrypted sms exists but what's the point if 99.999% don't care.
Yea it was great when signal had it built in to use insecure SMS. Easy to switch my parents to use signal since everything was there. They where not happy when signal stopped supporting it