As you may have realized, basic corporate finance is not that hard. It's totally doable for tech founders to learn by doing -- and savvy investors presumably give them sound advice and make sure they're on the right track. They'll also usually get somebody with business/finance experience to join if/once the product gains traction. The value founders provide is usually bearing the risk and effort in developing the "new product", while anyone with a MBA can deal with the business/finance side of things if needed, so the latter might be viewed more as a commodity.

But then, as we've seen in the FTX fiasco, some investors really just throw money around without any due diligence.