The deal was announced way before Destiny came out. As a consumer you had all the information you needed. You either dealt with it (that's why you're still here), switched or bought an extra console just for said content or left entirely because you didn't like the way they did business.
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Why are you arguing with what is best for you.
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How's it best for me?
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Any exclusivity is bad for all consumers because it shows them that they don't need to make anything better, they just have to take stuff from other consumers that don't bit their product.