HumbleBundle.com was reported to the Deceptive Design Tip Line over the controls for splitting a purchase price. According to the report, the site lets the buyer divide their purchase price between the content creators, HumbleBundle itself, and a charity. The reporter, using a $10 purchase as an example, notes that moving any one of the three sliders moves the other two, making it hard to set an even split or a particular value.
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HumbleBundle.com: Purchase price division is hard to set evenly
“HumbleBundle allows you some control in how your purchase price gets divided amongst the content creators, HumbleBundle themselves, and a charity. In the example screenshot, my purchase price is $10. (Note moving any one of the three sliders moves the other two, so it’s hard to set an even split or even value)”