Why'd it drop today? One supposes that instead of pressing shift+delete on their repo they click publish now so they get to write the headline that 2 big tech companies release small language models on the same day.
I retract the claim of proprietary. I misunderstood some of the licence wording. The license appears to be well accepted as a permissive open source license. https://spdx.org/licenses/AML.html
However, the model is proprietary. I'm tired of the open washing.