Maybe the rubes can be exonerated for falling to the incessant hyping of crypto but a smart person should know all crypto is a scam because the Washington Post, the bloody Washington Post told you it's either a Ponzi or a pyramid scheme in 2015. In 2017 you had Preston Byrne challenging that article in that he considered the scam to be significantly different from a Ponzi and gave it a new name, a "Nakamoto scheme" (as an aside, Jorge Stolfi will continue the debate in 2020 where he considers the difference not to be significant and I find his arguments to be rather convincing). But he didn't, not for one second, challenged the fact it is a scam. Attack of the 50 Foot Blockchain came out in July 2017. There's no way to enter the crypto space without mens rea in 2019.