Why is the guide for "government workers" as in "federal government workers"? Why not just "a guide to use Signal"? Is this article intended to encourage federal government workers to use Signal to share official information related to their federal duties - where it would be untraceable and deletable? Because that would be...illegal.
This runs afowl of the Federal Records Act.
Similarly, if you're at a publicly traded company, then you could be risking multi-millions in fines:
https://www.sec.gov/newsroom/press-releases/2025-6
https://www.sec.gov/newsroom/press-releases/2024-144
https://www.sec.gov/newsroom/press-releases/2024-98
https://www.sec.gov/newsroom/press-releases/2022-174