It's not just companies using the big 3 as simple VPS providers. A lot of applications are also hugely over-engineered for their actual needs, and unnecessarily

It's not just companies using the big 3 as simple VPS providers. A lot of applications are also hugely over-engineered for their actual needs, and unnecessarily ties themselves to the proprietary cloud APIs just for the sake of IAC or just for the sake of the simplicity of having the whole infrastructure at one provider. Or for the sake of using Kubernetes, for which I guess 1/10 of use cases are actually appropriate. I guess part of the problem is that using Big Cloud Provider X is the default in a lot of companies, and alternatives are not even being considered when starting out a new project.