I built something very similar to this a few years ago, sold it for way less ($3/service), and ultimately decided not to spend money marketing it. Building the product made it super clear that AWS costs were grossly inflated, which they hid with dark UX, and I wanted to help small teams and hobbyists. Today, if you are a small team that doesn't really need more than one large VPS, you should seriously consider Docker Swarm. Not to say that Flightcontrol looks bad. In fact, it looks quite nice. Something like this could save you a lot of money if you would otherwise need full-time devops.
Swarm never died. Kubernetes was designed for an entirely different level of scale and there is inherent complexity in that. Whereas starting a production-ready container service with Swarm only takes a few commands on a fresh Docker installation.
Honestly, Docker Swarm is so great. We use it with 6 very beefy machines (each 1tb memory/96cpu cores) for years already. It's so stable and well done, no restarts, crashes, or weird behaviors. We use it in a Hetzner VLAN and performance is excellent. We are very satistfied with it, and I would use it for even bigger scenarios. I even thought about building something like coolify/flightcontrol on top of it, so I can really easy have proper deployments of my stuff
