Depending on your workload K8S on Fargate can get your CFO super annoyed before you can say "Kubernetes".

Trust me, I've been there with compute bills up to 8000 EUR a month.

If you have light, finite (so not things that run 24/7) workloads Fargate might be worth exploring, in any other case classic VMs (with addition of Spot machine if you want cheap extra compute) is still the way to go.

In my humble opinion.