BO6 files uninstalled

What the hell is going on with a game that removes files from your personal HDD on Xbox??!!??
It's rather obvious they only want you playing bthe current game. It's shit so I'd rather continue with BO6 or any other title I've paid for, thanks.
But having downloaded BO6 form Ganeoass in November last year, I'm more than a little surprised to find it was removed from my HDD in the last week or so (since last okayy)
Zero chance I did it "accidentally"