It is interesting that this relates exactly to everything that goes as "cloud native" these days, without really mentioning the fact that due to Kubernetes and the Cloud Native Computing Foundation's huge landscape of open source software that targets specifically Kubernetes, you can have a comprehensive platform on "any" infrastructure. On-premise, private cloud, public clouds that are in the EC2/S3 era of services (VMs and object storage)... it doesn't matter. You can literally run the same database that powers YouTube, it's freely available and operates great on Kubernetes.
Yes, the problem is that someone has to manage it all (full disclosure: I work for Elastisys, a company exactly in the space of fully-managed application platforms on top of the infra operated by others).
But the fact that smaller cloud providers haven't had the money to invest in their capabilities to offer managed services to the same degree as the enormous hyperscalers isn't exactly impossible to overcome. In fact, it's never been more possible. Other comments here show that very well, too. And that the particular choice of identity management services is perhaps not the best for showing where the hyperscaler options shine.
Yes, the problem is that someone has to manage it all (full disclosure: I work for Elastisys, a company exactly in the space of fully-managed application platforms on top of the infra operated by others).
But the fact that smaller cloud providers haven't had the money to invest in their capabilities to offer managed services to the same degree as the enormous hyperscalers isn't exactly impossible to overcome. In fact, it's never been more possible. Other comments here show that very well, too. And that the particular choice of identity management services is perhaps not the best for showing where the hyperscaler options shine.