How can someone say that software is a scam?
Bitcoin is open source and does not contain malware.
It is a system that uses nodes around the world to validate transactions and it is the most decentralized network humanity ever had.
There is no one taking the decisions alone. It is a system of communication inside a consensus based governance.
All of these should convince you that bitcoin is not a scam but from what I see you have a clear picture of what is a scam and what is not already and you are just trying to justify your actions.