Former Patreon here, stopped donating after the months long radio silence. I don't think it's a scam, but moreso jobobot is just not very good at handling release schedules alongside juggling with irl stuff, plus feature creep forcing them to fit so many things.
I think it'd be beneficial for jobobot to scale down on the features and mechanics, and at the very least release something with new content despite any unfinished work or missing in the promised roadmap. I can sympathize with the feeling of pressure around promises and expectations, but I think most people wouldn't mind if jobobot just becomes more straightforward about the difficulty and scale down things as necessary.
I'm still hoping they are going to do a release again in the near future, and I'd happily come back to donate to the project.