The political aspect is that whatever data there is about an individual can be used against them, selectively, for say political purposes. This is a gross violation of transparency and the principles of a democratic society.
The ethical aspect is that I am being spied upon because of what I am not -- because I am not a US citizen. The talk about whether US constitution protects US citizens from dragnet mass surveillance (and thus whether NSA spying is unconstitutional) outright disgusts me (although I do understand the relevance for US citizens, of course). Telling one to "not use US internet services" is like telling one to opt out from the Internet. It's a "tough cookies" argument with very limited practical applicability.
Collecting information about me to make money out of me by selling me stuff? Honestly, in comparison, that doesn't feel that bad at all. Luckily, browser add-ons like Ghostery and various adblockers mitigate this to an extent.