Is the BLOOM RAIL license [
https://huggingface.co/spaces/bigscience/license ] proprietary?
Yes. The common definition is that if it is not open source, it is proprietary. But you don't need to take my word for it.
So I expect the BLOOM license would therefor qualify for an exception
as described in
https://wikitech.wikimedia.org/wiki/Wikitech:Cloud_Services_Terms_of_use
Point 3 in the "What uses of Cloud Services do we not like?":
"Proprietary software: Do not use or install any software unless the software is licensed under an Open Source license."
The Wikimedia Cloud terms of use even narrows it down to only Open Source Initiative approved licenses. So if not even CC0 licenses are allowed on Wikimedia Cloud (that license is only approved by the FSF, not by the OSI), for sure, the RAIL license is not allowed.
/Jan