I think Digital Currency like Crypto isn't getting much popularity because of these Scammers.They are one of the most strong reason why Government's aren't showing interest on Crypto Transections.
that might not be the reason why governments aren't showing interest in crypto , well scams are not new and there are way many scams in normal fiats published by the country ,
we cannot say that a currency is bad just because a scammer used it to scam someone
there are more reasons like the decentralized nature or the fluctuating value but no this for a government to fear crypto or to avoid it .