* DevOps teams can be multi-cloud relatively easy when using infrastructure as code tooling (Terraform, Packer, etc) and traditional DevOps practices
* Why manage a fleet of vanilla boxes when you can use vanilla boxes with Kubernetes and not get gouged by cloud providers in the first place?
You don't need to jump off the hype train if you never got on in the first place.
Using the providers path isn’t necessarily gouging, but it isn’t cost optimized either. The answer depends on you.
That said, cloud is like any tenant/landlord relationship. Your rights are linked to time and are whatever your contract provides. If you didn’t like Office 2007, you didn’t buy it. If you don’t like Office 365, 2021 edition, too bad.
Of course that only works as long as you're swapping out largely replaceable parts. If you built everything around some proprietary service then yeah, you've tied yourself to that anchor.
Cost+speed of scalability, and managed services. If you rarely need to scale, your workloads are all predictable, and you don't need managed services/support, you should just buy some VPSes or dedicated boxes.
You are really limiting your tech stack by using standardized things like Jenkins, Docker, K8, mqtt, kafka.
"Outsourcing" those functions to cloud services can be big win for a small team. Like all engineering, it's a trade off.