He honestly doesn't know why he does it, or still works for Fazbear's at all--but maybe it brings him some sort of comfort in trying to keep the new nightguards alive.

Well, that and the fact that he's lonely.

They'll probably come after him for leaving messages in hopes the staff will survive, but he also doesn't have much to live for anyway.

Scott (Yes, in this universe his name is Scott Cawthon since Scott actually voiced Phone Guy, but he's just the dude who manages the Telephone/Past nightguard here.) Picked up his old rotary phone, dialing the number for Fazbear's nightguard desk, and waited till the other picked up. "Hello, hello? Yeah, hi. New nightguard right? Don't freak out yet, I'm only trying to help you through the night."

He twirled the cord on a finger with his free hand, leaning back into the comfort of his couch--as he was calling from home.