How actually it's safe to use AWS for BTC related hosting? While AWS gives awesome ease of use, I'm worried about them having the ability to shutdown the project any moment, and actually being inclined to do so (Wiki-leaks for example)?
Any thoughts on the matter?
Well if you do something illegal the government can force them to do anything. That said it should be pretty safe. Encrypt your data and you should be fine. If you are handling millions of dollars in customer funds- then you should host everything yourself. And be competent.