I have F-droid installed as a system app and the only method for installing apps on my device. It is an AOSP device without Google play services or anything proprietary save for the minimum blobs required to allow the device to boot and communicate with the cell networks.
I don't enable root, as normally assumed of users that don't run stock. Doing so on Android is a well known terrible security idea. This is a hardened personal device where I choose to opt out of Google tracking, and backdoors like SprintDM.apk that Google bundles with their stock OS.
In order to install signal without Google Play I would need to turn on unverified sources on my phone and open myself up to Man In The Disk style attacks, and other security issues.
This is ridiculuous that a company that champions itself an advocate for security and privacy refuses to support users like me that opt out of proprietary software and the tracking systems that come with them.
Moxie not only said he will never support third party signed installation methods like F-Droid but has been actively hostile to those trying to do this for him.
Example: https://github.com/LibreSignal/LibreSignal/issues/37#issueco...
Moxie suggesting people fork and make their own private network that simply want a secure installation method of third party signed/verified binaries on security optimized Android devices is irresponsible and does not inspire trust.