Projects/people working on qubes-os

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Deployments of Qubes by entities with serious stakes?

Just curious to know about organizations that have deployed Qubes–I’d like to see how Qubes holds up in the high-stakes situations it’s built for. I know there’s SecureDrop that’s based on Qubes, but I haven’t really heard of its widespread deployment. Alternatively, has there been any serious pentesting efforts (red team, blue team, CTF, etc.) I can read about?