Do you know any other examples? What do you think about the evilness of these? Is it unethical or is it a normal use of free markets?
On the other hand they are employing a reasonable number of people and spreading some good money around (so it's not like they treat the content providers wholly unethically).
It feels like one of those borderline business models which is actually ok but could very easily slide the wrong way.
Are those mutually exclusive?
Are you asking about business models that are unethical/immoral but legal?
Those are pretty good examples with regards to Internet companies. I think you can find just as dubious actions in the finance industry. From charging $30 for a $1 overdraft to raising credit card interest rates at whim ... hopefully, new regulations will change that.
From finance you reminded me about these nifty tricks: http://www.themistrading.com/article_files/0000/0348/Toxic_E...