Thanks to investing into k8s I was able to migrate a non trivial production with minimal downtime between cloud providers 3 times now, who offered us free credits, without too much friction.
I lost the battle, they hired some AWS Sales Engineer who eventually climbed into a director position and implemented a complete lock-in into AWS offerings without rolling out k8s. As far as I heard from former colleagues after 5 years out of there their AWS bill has increased substantially and there's no way out.