Another not cool kid here. I've been running my little Saas for 12 years on fixed price cloud vms, €18 total per month (initially shared hosting). I'm sure I will ever hit my providers 20TB monthly traffic limit.

I settled with running lxc containers. I just couldn't bring myself to be bothered about docker. Before I left my last job we started using k8s. I wouldn't use k8s unless in an enterprise environment. Even then I would consider the need. "But Mom, all the cool kids have k8s!"