I don't think it's a problem if your friend has his first few rolls of film developed at a lab because having somebody else develop your film is a good way to get over the learning curve of operating the camera. It could be frustrating having to take on both ends of the workflow at the same time, otherwise.
However, once he is comfortable using the camera and producing photographs with it, he really ought to develop his own film. That's where Horenstein will come into play.
I believe, especially these days, if you want to do traditional photography, you really ought to be developing your own film but the smart person takes it one step at a time.