Besides the working conditions at contracted factories?
One could make the argument that advertising at and subsequently locking someone into the walled-garden ecosystem is unethical because you are artificially inflating the consumers' opportunity costs. Some would look at that and call it a milder form of price-gouging.
It's a really weak argument compared to literal human rights abuses, but we're talking about ethics here, which is necessarily broad.
There is absolutely zero evidence in that article. A lawsuit is not an indication of guilt by itself, particularly when the plaintiff was recently terminated.
