Update from Humble Support regarding Classic refund : r/humblebundles

Kids Humble Bundle

Buyer's remorse? Get a refund from the App Store, Google Play, Steam, Humble Bundle, and more

Is it possible to refund a redeemed game? : r/humblebundles

Humble Bundle Giveaway! - steam post - Imgur

Steam refunds: Does Valve win either way? - Polygon

Humble Choice - Manage Your Membership – Humble Bundle

Electronic Arts titles no longer on the Humble Store, code redemption ends March 18th – Delisted Games

GMG is offering refunds for those unhappy with the lack of pre-order bonuses on the PC version of Dead or Alive 6

Less Humble Bundle

In Advance Of Upcoming Steam Summer Sale, Valve Introduces Steam Refunds – Techgage