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This is not an organic use of an altered meaning. The term is imposed by huge corporations who force it on their developers and everyone who wants to get funding in the Llama ecosystem.

It has nothing to do with natural language evolution.

Orwell was in large part against re-definitions of existing words and the removal of words in order to reduce the basis for productive thought.

Re-definition example: War is peace, freedom is slavery.

Since the new euphemism for downloadable models is a re-definition, Orwell would have been 100% against it. In fact the new use of "open source" is an Orwellian term.