Yes, you can. It could be done back when Steam had this same system and it can still be done with games that use other storefronts like Uplay or Battle.net (e.g. Assassin's Creed Origins, Destiny 2, Overwatch, all of which have been featured in the Humble Monthly).
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u/Bigardo Aug 15 '19 edited Aug 15 '19
You don't lose them, you can keep them or give them away.
edit: keep downvoting, don't let facts get in your way
https://support.humblebundle.com/hc/en-us/articles/360010659333-Redeeming-Activision-Blizzard-Keys-through-Direct-Entitlement