You use Simplex over Signal for improved privacy and no identifiers, not Matrix.

Signal is still very good though.

https://devenv.sh/

Note this also builds oci compatible containers you can run with podman, kubernetes, etc.

It lets you develop on bare metal in an environment the same as the docker container and is reproducible rather than just repeatable.

Google play services betrays you.

Use https://grapheneos.org/ and it sandboxes Google play for you, but ironically requires a Google Pixel phone.