What do you mean by PAAS?

In my experience, every company that ends up adopting a microservices architecture ends up building some sort of layer of developer tooling on top of their ops infrastructure (whether it's K8S, EC2, or something else). This is because in microservices, you need to make it easy and cheap to deploy new services, which means developers need some sort of access to operational tooling (or else you need a huge ops team).