All signs point to this being a licensing problem. Maybe Activision thought they'd renegotiate the license and then couldn't settle on a price. Or if one wants to be cynical, most game sales come within the first few weeks after release anyway, so maybe that's all Activision wanted out of the release of Legends.
Quite a bit of content disappeared from various digital distribution stores on the 1st of January. Always a licensing thing.
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