Stealing is a weird choice of words. Do you steal the oxygen that you breathe, or the water that you drink ? For it to reach your tap, it has been stolen by some fish's lake
Honeybees have the capability of depleting such resources because they are far more active than they actually need to be, which is one of the reasons we use them for crops with very high densities of flowers, like blueberries. They are efficient and thorough enough to get the job done.
There are times of the year (in particular, late summer/fall) where good flowers are especially hard to come by, and so solitary bees can have trouble trying to compete against a hive in the area when they are trying to gather the resources they need to reproduce. Meanwhile a hive also has honey stored so dips in availability during the year matter much less.
Honeybees produce more honey than they need for several reasons, mainly that a) they are natural hoarders, b) we've bred them to hoard even more.
It's true that colonies can become pollen-bound and/or nectar-/honey-bound, and thus have too little space for brood. When this happens it's very likely that the colony will swarm off, leaving behind as few as 20% or so of the bees behind, as well as and swarm cells from which one victorious queen will emerge, and then the rump colony will have plenty of honey while it's weak and recovering its numbers. During that time they'll consume whatever it was they had too much of and thus make room for brood.