Neil Chilson on why the US can't ban open source: "I think it's pretty unlikely. It runs smack into some very clear First Amendment issues, some right-to-compute issues. There are constitutional reasons it would be very hard to do such a thing in the US, especially if you're trying to target open source models developed here." "Practically it's always been hard to shut down software. These weights are not giant files. They're transferable quite easily, and running them you still need a lot of…