When I go to IKEA for a desk chair, I have to walk though many other unrelated things to see the desk chairs. The difference is that IKEA sells IKEA only.

This is the sort of thing that makes people on HN start screaming "ZOMG! Walled garden!!!!11!!eleventy!1"

I mean, that's not what a walled garden is. A walled garden would be if IKEA sold houses that you can only put IKEA furniture in.