Because you're breaking core business principles through government intervention that isn't needed.
Apple is successful because they produce good products that people want. Why you think their success is some reason for government to force them to change common business practices makes no sense to me.
Look, Spotify has a platform at
www.spotify.com. Your argument says that any musician should be allowed to advertise their music on spotify.com without paying a fee. And they should be able to put a link on spotify.com where buyers can go to the artist's web site to buy the song. You're arguing that Government should force spotify to allow that to happen.
...and your argument would also suggest that Samsung should be allowed to display their phones in the Apple Retial Stores, without paying a fee, and allowing Samsung employees, within Apple Retail Stores, to direct Apple's customers to a different store to buy those products.
Makes zero sense, but that's your argument.