You can't work in fashion because it uses child labor. Rare metals used in electronics are mined in places with terrible work conditions. Don't even get me started on petroleum dependent industries.
What does that leave us with ?
Even companies that build apps or SAAS make their money from clients in these industries or consumers who are as a majority employed by them. Just because we establish a few degrees of separation from the problem, doesn't mean we stop being complicit in it.
Public companies have a responsibility to their share holders to maximize profit. Every legal avenue there is to do, will be used by these companies. If Amazon stops doing so, someone else will and eventually they will have enough of the market that the responsible company will have to close shop.
Take the example of a multiplayer game. It should not be the responsibility of the player to not exploit the rules of the games to their fullest. It should be the responsibility of the developers to fix exploits and ban/punish gamers who outright attempt to break the system (cheat).
It seems that the political left (which usually drives these movements) would rather put the onus on the companies to change while taking millions in lobbying money, than hold them accountable for their actions.
I recognize that the systemic favoring of republicans in the electoral system, might force the left to keep appearances, lest be viewed as hostile to businesses and lose the vital 5% of the swing electorate. But, that still means, that the problem is lack of electoral reform and not 'Amazon being a greedy company'.