Probably far from being "super simple", but I made a bot to automate different tasks in a online game.
Customers can either self-host the software them-self (min $5/month) or pay a higher price (min $10/month) and use my "cloud" service where I host and install the software for them.
I use Golang to build everything, caddy for https, Hetzner for hosting, and docker to deploy cloud instances.