RickyAndersen: Wow... that's cruel.
Even if the bundles bought for myself, I won't get gift code for the game I've already owned?
AWG43: According to that note on any of those bundles pages you should get a gift code for the game you already have.
Yes, but only if you did not buy them as gifts.
(Maybe it's just my bad English so ...)
GOG support:
"Unfortunately, purchasing the bundle as a gift code and then redeeming it on your own account made the titles which you've already owned simply not be added again to your account and gift codes won't be generated."
"please note that unfortunately there is no way to convert games from Anniversary bundles into gift codes if you don't own them on your GOG account. This is because the order only 'sees' the entire bundle, and doesn't list individual games, so effectively there is no option for us to 'break up' the bundle manually."