I think a big objection to moving off AWS is a result of enterprises locking in to AWS-specific technologies.

AWS has a lot of neat, domain-specific products and managed services, but it's important to recognize those come with vendor lock-in and that's by design.

If possible, build out your stack to avoid dependence on AWS-only stuff. It's worth it to ask "if I wanted to transition away from AWS in six months, is this addition going to help or hinder that goal?" It's a lot easier to migrate something that uses generic technologies like VM instances, vendor-neutral containerization, and managed databases versus something super specific. And AWS has a lot of super specific stuff, just look at their ever-expanding product list [1].

Once you get away from the specialized domain-specific products, you start to realize that AWS pricing is really nothing special, particularly for VM instances as you've noted.

[1] https://aws.amazon.com/products/

In my experience a lot of senior ops people are still hesitant about Google's cloud services having been burned by them in the past. Google seems to have some reputation problems, however true or untrue they may be.