Imagine you are the first level manager in charge of these things. You've been fending off the multi-cloud nonsense ever since Gartner first mentioned it around 2017. Google has this outage. You've documented this business risk, along with the costs of mitigation (to include being multi-cloud) all this time, but now you've got an SVP breathing down the neck of your director. How do you handle the situation?
Sure, you could spin up on AWS or Azure, but if you do, you're going to have to re-litigate multi-cloud in order to shut down this emergency deploy--you will probably lose, which is going to cost the company a LOT, and cause you a WHOLE LOT of aggrivation. If you go with a provider that no one has heard of, however, shutting it down will be almost zero friction. If you are challenged on it, you can give back some nonsense about avoiding first-tier price gouging in this situation, which is why we had this solution prepared for immediate rollout.