This is... troublesome. How do we know that the same can't be done here later down the line? (AKA Altering the deal)

Because people actually own Xboxes here. The adoption rate in Japan is stupidly low, so it just doesn't make business sense apparently. Plus, first person shooters are not that popular in Japan anyway.

Yes, but that also scores no points with MS for Activision to go along with this. All Activision saves is whatever promotional costs Sony absorbs for getting to treat Destiny like an exclusive, and in return, they get to keep the cycle nice and closed.

If Destiny doesn't sell well, then it was a bad deal. If it does, then, of course, it's just another reason to not bother getting an Xbox in Japan.

I am starting to wonder if there really is any bigger feud going on between Activision and MS at this point, or whether this is all just about Bungie.