They actually do, that's why some companies also engage in Greenwashing, which is the practise of pretending to be environmentally friendly when you are actually not.

Because the brand of these companies is so valuable, once exposed they actually take steps to fix issues. Perfection is enemy of the good though, but things are actually moving for the better when there is a trend to demand the better.

There's of course counter trends, like eat more meat burn more fuel, screw the foreigners etc. I bet you, if these become dominant, the same brand will be all over it. "For every phone you buy from us, we kill a baby seal and throw a battery in the ocean" could be the next campaign if the ant-environmentalism catches up.