Someone built an AI startup making $360K a year in profit by answering phone calls for plumbers and HVAC companies. Such a smart niche. These founders built AI voice agents that answer customer calls, book appointments and help contractors collect overdue payments. And the results are pretty impressive. > $979K TTM revenue > $360K TTM profit > 85% annual growth > $90K revenue last month > Bootstrapped Even crazier, about 40% of appointments booked by the AI happen after business…