As long as I am certain, I know that bitcoin has long grown pass the stage of skepticism (whether or not it is a scam). Bitcoin has vindicated itself several times amidst all kinds of allegations of it being scam or some kind of Ponzi schemes. Maybe what people should be asking or considering is how long bitcoin is going to last. Whether bitcoin will be in existence as long as internet is functional or it will be defeated by the government one day.
You know what the biggest scam is :
Bitcoin was and will never be a scam **CoinL
What you call the biggest fraud happens now with bitcoin also. Many people in different countries pay hugely in the name of cryptocurrency tax. The government of many countries have discovered how to successfully task bitcoin or crypto earnings.
If by scam you mean a joke that became real and is one of the biggest currency both as a cryptocurrency and as a legal tender , then Bitcoin sure excelled in that area.
At first people still thought it was a scam until Bitcoin started fulfilling its vision by creating initiatives that not only spurs other crypto currencies to do better but also brings profit to the investor who has faith in its modus operandi.
How else has Bitcoin got to show it's not a scam? Afterall, it has been adopted by several countries as a legal tender, have Bitcoin ATM machines and serves traders just as fine for payments and transactions across borders.