From the incident report it seems the impact was limited to VMs in one DC in one region to be stopped, as the power was lost. And some service degradation in the region.
So not that much impact. Of course resources in this DC would stop working, but the rest of the region was still working properly. If you built your infra in this region in a resilient manner, your services should not have been impacted that much
https://en.m.wikipedia.org/wiki/Jevons_paradox.
Edit: the other comment below mentioning this did not load initially…