Either your fan of Justin Bieber or you clearly don't know your facts or even read the DS Article about him complaining about his label.
JB doesn't even write most of his songs so I don't know where you got that from.
My World EP: 4/9 tracks
My World 2.0: 10/11
Never Say Never: 1/1 (only original track on album)
Under The Mistletoe: 10/15
So of the 50 tracks he has released on albums, he has been credited as writing 38 of those, the songs he didn't co-write on Under The Mistletoe were Christmas cover (I believe they are anyway) and I'm not even a fan of him. People are just unnecessarily horrible about him a lot of the time