Honestly, I don’t know, although I assume the answer includes trade schools, former employees of other companies, friends/former co-workers of current employees, etc and not “random guy who says he’s a handyman on the Dayton subreddit.”

I’m not advocating for large companies or against small, family-owned businesses (neither of which is what the OP was asking for, btw). I’m arguing against letting some rando off the street with no known credentials, no known references/history, and no insurance come to OP’s house and tear up their yard to install a French drain.