[ColdHeat]

Here's my reply to him from https://news.ycombinator.com/item?id=34328461

> Good question! No signs connected to the server until I reached out to some other sign owners to try out my instructions.

I do not know how many signs are out there. I imagine most people would have just unplugged their sign after the company's API vanished since any data would be stale and useless.