We could also achieve universal peace if everyone just threw down their weapons, and no one would go hungry if everyone would stop being greedy. Unfortunately, people aren't rational, and there's cultural/social constructs that keep these things from happening.
If we want to change them for the better, we unfortunately have to operate within the constraints we're faced with. We can change those constraints with hard work, but can't just act as if those constraints don't exist. It's the same way folks pretend that being "color blind" re: racial issues will solve things. Would be great, but sadly plenty of folks are incapable of not being racist, and historical harms mean that we can't just pretend that perception is the only problem.
Exactly! I also haven't bought more than ten items from Walmart in the last fifteen years.
It can cost a little more, and requires patience, but I can think of very few times I've actually needed (versus wanted) some item before I could get it not via Amazon or Walmart. Even with the added expense for some individual items I'd wager I've spent less overall since it makes impulse purchases easier to avoid.
It's probably not amounting to much in the way of resisting these mega corps, but it isn't as difficult as some folks imagine.