from Gamerbytes
"Speculation as to why Doom was pulled revolves around rights issues involving id Software's acquisition by Zenimax and the XBLA title being published by Activision. "
Outrun Arcade is also being pulled at the end of this year due to licensing issues.
Edit: Supposedly the game file is not up for download after you access it in your download history, so if you delete it you can't redownload it.
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