There's ethics and there's legality. If a practice is truly abhorrent then it should be illegal and penalised as such, and ethics for consumers at that point is moot. What was going on at Blizzard was illegal and they go in trouble for it and that's all to the good.

I'm all for customers apply pressure through their buying habits, as you say that's entirely ethical. It's your right as a citizen. However most people don't know about any of this stuff and they shouldn't really have to.

Companies are huge organisations, many of them have many conscientious and ethical employees that do a lot that's great, but then some that are less ethical or are under a lot of pressure or have few options all shitty and bad things happen. Most of those things we never hear about. The chances that this one thing you hear about is truly representative and differentiating from the competition is probably actually pretty unlikely.

So sure, especially if you have a cause close to your heart that's fine. We should be holding companies to account, but laws and regulators exist for a reason. They represent us and are our primary tool for dealing with this sort of issue.