I don't see bitcoin to be an illuminati scheme as they would not be willing to give financial freedom to people all over the world.Rather they would only want to control the whole world by becoming more richer.Bitcoin has made the lives of thousands of people across the world and free mansions would not be liking it.
What if Illuminati owns the majority of the bitcoin?
Bitcoin is not an illuminati scheme and not a scam. But I can tell you that few are using bitcoins to scam people. They use bitcoins as a front to lure people and invest on them like a networking scam. They are spreading on social media sites. Beware of them. Investigate before to buy btc.