Well, for example, people and companies could target any of the employees directly, who work on those kinds of deals.
Target them personally, make them personally responsible for the actions that they did while thinking that they were some faceless entity in the machine, and make them toxic entities to hire or work with.
Sure, the company itself might be able to insulate itself from consequences, but not the individuals themselves. It would make people think twice about the actual negative effects of their actions, if they knew it would put them on blacklists.
Companies are run by people. It is not some faceless AI. Instead, decisions are made by individuals. And individuals are vulnerable.
Lots of companies are able to exist without giving in to completely silly demands like "increase the size of these islands".
> If you want change
Actually, customers are able to cause lots of economic damages to companies, or their employees.
There is more that one way to Target Apple employees than what you suggested.