That only works if there's meaningful competition. With megabrands like Nestle who make 1/4 of the grocery store, or game publishers like Ubisoft who receive 1/4 of the industry's revenue any kind of boycott is dead before it begins.

In a society with a functioning government, megabrands who abuse their neighbors and/or customers would be hit with significant fines and be heavily regulated out of the bad behaviors, but the US hadn't had a government interested in helping the common person for over half a century

I don't disagree. I disagree with the idea that it's 90% the fault of the consumer.