True but the emissions saved if everyone copied in with the proposed actions dwarf in comparison with the emissions saved if those 100 corporations did the same.
So what is easier to do? Change the lifestyles and circumstances of billions of people in every country in the world within half a decade or so the same with large companies?
Do it all. Every bit counts. Companies suck. Boycott the ones who don’t help.
We are well past the “what is easier to do” point and need to grasp for every straw there is though.
But the efforts done are more akin to everyday people infighting about stuff that would amount to 5% saved on the expense of pushing against the real culprits. The planet’s resources are limited but so is people’s attention span. Better focus the efforts proportionally on emitting sectors.