Yes. It looks complicated at first glance, but you only really need to know the basics. Watch a tutorial. 

There are tons of models too out there to download and compatible with ComfyUI.

You could probably find a way to automate everything, i don't know

Nice, would love try it. We also need to find a way to automate the thumbnail image generation for the markets. Are you referring to this: https://github.com/comfyanonymous/ComfyUI ?

mega_dreamer

You coumd self-host ComfyUI and generate the images offline on your metal instead.