Same reason IKEA has no story: "As a custom, if I know what I want to buy, I would like to be able to go the shortest way from entrance to product to exit."
And yet IKEAs have signs notifying you of shortcuts. If you know what to get in an IKEA and know which department to find it in you can get in and out with some real quickness if you pay a little attention.
It's clearly not their main target, but it's also obviously still a target.
I am old enough to know a time when these signs did not exist and the shortcuts were unlabeled doors looking like the typical emergency exit. Regardless of the signs, IKEA makes it deliberately hard to just get what you want without being exposed to products you probably don't want. I find that apps that send you on a detour is pretty much the same tactic.
It's clearly not their main target, but it's also obviously still a target.