"But Bitcoin is a great way to monetize excess renewables"
No, this was never true. If you make a capital investment in a mining rig, then you want that rig making you money 24hrs, not just when the rest of the grid is not consuming renewables.
The crybabies who freak out about The Communist Manifesto appearing on university curriculum clearly never read it - chapter one is basically a long hymn to capitalism's flexibility and inventiveness, its ability to change form and adapt itself to everything the world throws at it and come out on top:
Thus, "open AI" is best understood as "as free product development" for large, well-capitalized AI firms, done by tinkerers who will not be able to escape these giants' proprietary compute silos and opaque training corpuses, and whose work product is guaranteed to be compatible with the giants' own systems.
The instrumental story about the virtues of "open" often invoke #auditability: the fact that anyone can look at the source code makes it easier for bugs to be identified.