Harder to say in practice than that, because Minix 3 has production deployments on the Intel (CS)ME, across hundreds of millions of machines, something that the Hurd never had
Tanenbaum published an open letter about this [1]. The gist of it is that Intel took MINIX3 to create the Intel Management Engine, but never contributed anything back. This was permitted by the BSD license, but all these deployments didn't actually help MINIX3 itself grow as a project.
> because Minix 3 has production deployments on the Intel (CS)ME
Is there actually an official Intel document which confirms this? So far I only saw claims by third parties. Do we know which version of Minix was used, and which parts of it?
