Open source is always vital for science and technology to advance, and is particularly important for the study of (artificial) Intelligence, which is still at its primitive stage. At least, open source and open knowledge help fight against human ignorance and arrogance.
All foundation models are in fact models of knowledge, mainly based on open knowledge already developed by mainkind. Obviously knowledge (models) of mankind should be open sourced! (Again, please do not confuse knowledge with intelligence.)
My Berkeley EECS Colloquium talk last week on Pursuing the Nature of Intelligence was recorded and is now available on YouTube: May view it as an overview of an endeavor to establish the study of Intelligence as a scientific and theoretical subject.