Scam is a global issue even before crypto, I think some is just saying that crypto is all scam since it's done in the internet. And as we all know scam normally happened using the internet thus, most people think it's scam. I think whether it's crypto or not, scam is inevitable because scammers just can't get off their hands to easy money.
But these days, there are still differences.
Scamming money can be reported and police will find a way to track these scammers. On the other hand, if you're cryptocurrencies are scammed, if Bitcoin is not regulated in your country you will never find a way to get it back. You can report it to sites but you can't be helped by the government.