Apple doesn’t sell songs only made by them ... LOL ... and the movies I get aren’t made by Apple. I read newspapers that aren’t printed by Apple and I can surf to websites that aren’t made by Apple. My e-mails are restricted to go to only Apple employees or Apple.com addresses.
AND ... Apple doesn’t prevent my iPad or iPhone from getting apps from anyone but them ... :-) ...
I think someone has steered you down the wrong track.
must be an iTrack...