&gt;Amazon is the only place I have seen blatant user-targeted dark patterns. &quot;Order within the next hour to ship today&quot;. Four hours later: &quot;order within the next 2 hours to ship today&quot;.<p>That could be a reaction to facts on the ground.  To give you a guaranteed shipping window, they need to estimate sales.  If sales come up lower than expected, the cutoff moves a few hours.<p>You see this kind of thing all the time in airline seat pricing.