You’d die on the back of unreliable operation and relatively high maintenance. A DIY system built off of cheap ESP32s is never going to be reliable enough. The system as described above is the sort of thing I would happily operate for myself, but would never attempt to sell as a product. Anyone who’s tried to hold together a few dozen ESP32-powered IoT devices will likely attest—they’re very impressive for their cost, but hardly reliable on the scale of years.