This is my stance on it:
https://bitcointalksearch.org/topic/m.18033162
tl;dr: it is not a scam because the notion of scam cannot exist in a trustless environment.
It is a crypto system, mainly centralized in the hands of a "central banker", and all this is documented, so if you use that system in a trustless environment, it means that you did your homework and agreed, or it means that you don't care, or it means that you are careless.
Good philosophical argument but those that get lied to and deceived and subsequently lose greatly financially may wish to disagree with you.
I don't think we should seek to create a place where if a deception/trick with negative impact is conducted we can't say its a bad thing and try to prevent it happening again.
You will always find those that can take any seemingly obvious good or bad thing and give you a convincing and very logical thought path to the opposite view. In the end the vast majority will go with what seems obvious without thinking 50 levels deeper than they do generally in life.
Someone lies and deceives you and the result is negative to you. 99% or great of people will agree its a bad thing. There will be exceptions but if you live life based on the exceptions then you will find it hard to be part of society really.
I think the only place the word scam is not applicable is a place where lies,deception and trickery are not able to have any impact on the outcome of events.