I think the main reason of bitcoin being considered as scam is the hidden facts behind it.But since it lacks Identity of invention no wonder that people consider it to be scam,but the facts should be proven to a great extent that people start believing it doesn't require any proven identities.
You will understand one simple thing: nothing is unambiguous in the world. Any object or event will always have another side. The same applies to the anonymity of bitcoin. In many ways, this gives great advantages to the use of this coin, but there are certain difficulties in the video of scams. It's about people, not a specific design. The weapons in each hand shooting. Think about it at your leisure.