Should Buddhists avoid Amazon and Starbucks out of concerns about tax avoidance?

Recently companies such as Starbucks and Amazon were accused of avoiding paying UK tax. Many people were quite upset about this and people began to boycott those companies involved. From a Buddhist perspective is there any problem with this? The companies are not stealing nor are they breaking any laws - tax avoidance is perfectly legal as opposed to evasion which is not. I appreciate there are many arguments that could be made against this practice around fairness, justice, social responsibly etc... However I'm interested in the Buddhist angle - perhaps thinking about the precepts or maybe broader concepts such as karma and dependent origination or another aspect of Buddhist thought that I'm not aware of.