The problem isn’t that they’ve grown too powerful, it’s that they either haven’t recognized their own power or have willfully rejected the responsibility attached to it.
There is no responsibility attached to it, at least not legal responsibility. Even that isn't enough for anyone that gets to powerful and beyond enforcement.
The truly sad thing is that you expect them to act responsibly. Companies will (and have) work children to death if it helps maximize output, if you expect them to act benevolently then prepare for disappointment.