It's really good to see more developers getting into the space of writing open-source platforms for services. I believe there is room for much growth in this field. I'll take a deeper dive into 1backend and check out how it works.
hook.io has pretty much a zero dollar budget and maybe $150 spent on marketing. It's been slowly and steadily growing for the past years and I'm happy with it's progress. I'm currently working on building integrated hardware solutions with raspberry pi to offer an open-source local version of Amazon Echo or Google Assistant type devices.