>Instead you can take k8s, deploy it to bare metal, and have a much much more power for a much lower cost. Of course this requires some technical knowledge, but the benefits are significant (lower costs, stable costs, no vendor lock-in, all the postgres extensions you want, response times halved, etc).

>all the postgres extensions you want

You can run Postgres in any managed K8s environment (say AWS EKS) just fine and enable any extensions you want as well. Unless you're conflating managed Postgres solutions like RDS, which would imply that the only way to run databases is by using a managed service of your cloud of choice, which obviously isn't true.