They are NOT from craigslist. They are a company that promotes bots that infiltrate craigslist and spam the posting section. A few companies are using them on craigslist and they are breaking the TOU. If you get caught, craigslist will BAN your company from posting there.
Disgusting work ethic, they flag the other small businesses trying to make a living. Do not give them your business. It is an ugly attempt to take out the honest worker.