This pops up every now and then, last time was just yesterday:
https://www.steamgifts.com/discussion/oQMpu/humble-bundle-doesnt-allow-giving-away-on-steamgifts
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https://www.reddit.com/r/humblebundles/comments/7ezo3u/response_from_humble_support_about_giveaways/?st=JACMDT5O&sh=c5d79ace
TL;DR: Gift links are for friends and family. Humble does not support or encourage giveaways, reselling, and trading, with all three being referenced together.
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