If you're implying that a significant fraction of delivery people are riding stolen bikes, I wish you could say it more directly. I do not believe this to be the case. Many of these guys are from Mexico and Central America, and if I may use a cultural stereotype, their demeanors are generally humble and respectful.

One delivery guy told me that he rents his bike out on shifts he's not working, and the bike works two shifts a day. This is serious business.