What to expect when AI analyses AI's bias vs "real world"?

Hundreds of b$ already "invested" by NVidia, MS, Amazon, OpenAI, Google, Meta, etc. Now they're ready to pump another bunch of hundreds of billion $. Isn't it by far the biggest financial bubble ever created? Can such kind of money even exist without astronomical bank credits, and what happens to those banks when that game ends (and by domino effect virtually every one)?