At this size, I think we have to start worrying about a 2008-type default risk. AI companies will have ordered all the RAM and paid some kind of deposit for that, but actually taking delivery and paying for it is still in the future and the sums of capital involved are extremely large.
That's the reason RAM companies aren't expanding. Worst case, they can sell their normal production to gamers.
What kind of default risk?
What we got in 2008 was central banks (eg Fed and ECB) willfully collapsing nominal GDP in their economies. Have a look at the dot-com bust or Black Monday for comparison.
Also there is a ton of debt flying around, its not just equities hurting VC funds, real banks are facing risks now.