You love semantic arguments.....you're not going to back me up on this.
Child age is the factor on babysitting vs kid watching. I've used both in reference to myself when someone has called and asked if I wanted to go do something on a Saturday and I was charged with said care. So .....I got a call to play a round of golf and then I call the 14 yr old girl down the street to do what ? And she earns money doing this service which is called what? And she refers to this service when talking to friends and family and potential clients as what?
No one can or should second guess the bf's motivation for anything he's doing...only he knows.