Both companies are excellent, and I'd absolutely trust them with my business, but neither can replace something like AWS. The friends I have at companies who are actively using AWS are all relying on a fairly large number of AWS only services. Either they'd need to stand up their own replacements and host those services on VMs, or in some cases rewrite parts of their stack.
E.g. if you're using AWS Cognito then you're not going anywhere.
Exactly! You can get a bare minimum, like a virtual machine (EC2) or storage (S3), which probably enough for small and medium enterprises (SME). However, if we move beyond, I'm not sure as I don't have experience with them. Now, if I'm building a prototype, I want something quick and just a lack of Cognito is a deal breaker.
IMHO Aws is designed for totally embracing their philosophy and language. You don't understand two Aws Devs talking to each other. Even organizations are internally structured for Aws operations. This create something even stronger than a dependency.
> Making yourself a subsided of Amazon was never wise
True, but the AWS pricing doesn't make sense otherwise. If you're not using the managed services, then the value proposition is no longer there. Using those services is what allows you to build massive systems for relatively cheap, with much less staff. We had a project that was to be moved from on-prem to Azure (same deal), it went from thousands of Euros per month to fitting into the a free-tier, but only because we could use managed services. Spinning up the same VMs would cost more than hosting it ourselves.
E.g. if you're using AWS Cognito then you're not going anywhere.