The Chromebooks were meant to be cheap computers to give you an Internet browser. They mainly target schools because kids destroy them fast, and older people that really just want to go to Facebook, YouTube and the likes. Their whole thing is basically they're cloud based and kinda disposable. They even ran this ad about it.
It's like the MacBook experience for cheap and the only thing it runs is Chome and Android apps.
They're kind of slowly becoming the new thinkpads thanks to good coreboot support for them. People have really been unleashing them and doing all sorts of crazy things like eGPUs and stuff since they're so easy to mod the BIOS.