Nvidia invests, that equity check gets used to secure 10x it in debt with the GPUs as collateral, and then they buy the chips.
Nvidia gets paid, so they don't hold the debt liability. But, if AI revenue doesn't cover those debt payments before the GPUs depreciate, the loop starts to unravel, and fast. CoreWeave, Oracle, all the "neoclouds" etc. will blow up, and there could potentially be a ton of PE debt that is now under-collateralized due to depreciation, causing a pretty big haircut to basically all of private credit.