A few million dollars. Kickstart the project, get 100 a head and 100,000 backers. Also check with Uncle Sam and see if there are any grants that can be used for this. Start a campaign and get rich concerned people to donate. Jeff may also want to show AWS can also train AI so maybe even get a break there an Amazon can get some nice PR. The list of possibilities seems extensive given the price tag of $12MM and upside of a fully public GPT.