You might be happier with a fixed-size VPS, instead of a cloud provider,
Exactly - the whole point of a cloud provider is scalability. If you're doing a personal hobby project, get off big scalable clouds and get yourself one (or multiple!) fixed-price VPS or dedicated servers.
But as I think of it, I think what people really want, for hobby projects, is not so much the scalability, but the managed offerings. They want zero-ops, zero-maintenance, zero-server-updates hosting, with a fixed price and hard limits. It won't be infinitely scalable, but it doesn't need to be - it's a hobby project.
They just don't wanna sysadmin a server of their own. Which is completely understandable.
There's room in the market for something like this.
offerings were published on the main page and afaik no takers. We migrated off whatever hypervisor we were using onto wok/kimchi and finally to proxmox, so my scripts still work, but proxmox has turnkey linux "quickstart" servers now as well as lxd, so there's less reason to use my scripts.