> Anything less than that I'd say it's complex and you'd be better off using a PaaS

Kubernetes is available as a managed service in AWS, Azure, Google etc and this is likely to be the most popular deployment model.

By any definition this is a PaaS and if you add in custom monitoring, logging, security, ingress etc. is going to be just as simple and significantly cheaper than using a managed solution.

If you're just building a basic website then sure it's an overkill but fewer people are building those these days.