yea I want to know too if I can enter for i am bread only

Same here, would recommend the gift giver verifies that the person doesn't own both games before revealing the key

Oh, in that case it clearly breaks the rule. Users should avoid entering a bundle in which they partially have its contents; whereas you must activate the key if you win, which means you can't enter a giveaway which you already own. Usually you can't see giveaways which you already own, however, sometimes you can see them (mostly they are DLCs, though).

https://www.steamgifts.com/about/faq