You're never "forced" to own anything. There's always the option of just skipping it. BOTW single-handedly carried the successful launch of one of the fastest selling systems ever.
A game does not necessarily have to be exclusive to be a killer app. If a game is desirable enough that people will buy the hardware it runs on in large numbers just to play it, then it is a killer app.
You're "forced" to own a Nintendo console if you wish to legally play BotW, yes.
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