Bees that are free choose to live in a tree stump
Tree stumps are expensive and hard to mass produce.
For all intensive purposes to a bee this is a tree stump.
it smells like one
it looks like one
it has the correct shape
it has the correct volume
it has the correct symbiotic bugs and mycelium.
Bees need a space that is free for them to build comb in what ever shape and cell size they deem correct
this is all part of their self defence systems.
Area occupied by bees.