How is Starbucks unethical?

The Wikipedia article on Starbucks lists a section on "Controversies". Note that not all controversies are about Starbucks being unethical. I won't go into all the details here, but some of the things they have been accused of is of selling unhealthy products, unethical market strategies, and others. I leave it to you to research the details, and decide whether they actually did something unethical.