Fellow iRule immigrator here and yes, I’ve been petrified of this happening. I went through this with iRule and vowed to not do it again. Then I made the mistake of dumping probably 10x the hours into HR. Albeit my HR is 10x more powerful than my iRule remote ever was. I have asked Bill if he would consider selling HR. I would no joke purchase it not to make money but to keep it alive. He wasn’t very receptive to it. I don’t want to put words in his mouth but he basically said to not worry, that he would keep it alive.
With all of that said, I do use Home Assistant and I love it. I don’t know that it could be as customizable as HR, or if so, I think it would take 10x longer to create. But it is a legitimate option. I think you could create most of the functionality with possibly less design.
I played around with Roomie before I came to HR. It was pretty versatile but did have some limitations where I would say HR has none. That was probably 2017-2018; Not sure what Roomie looks like today.
Curious to hear what others have to offer for a plan B.