Putting all your eggs in one basket never a good idea, regardless of the vendor. If multinational companies diversify their cloud usage, why does the DoD not do

Putting all your eggs in one basket never a good idea, regardless of the vendor. If multinational companies diversify their cloud usage, why does the DoD not do it? What's important here is a mandatory multi cloud buying requirement, where each vendor continually competes on price, quality and features to retain the customer. If any vendor slips, new ones should be able to take their place. Procurement by the feds needs to be more dynamic