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.
Scammer did scams with fiat and bank accounts etc and now they are scamming crypto also. Everything which has a value is subjected to be exploited by the scammers. Saying that scam are only because of crypto is wrong.
I believe scams can be dealt with without centralized system or authority but rather with decentralized anti-scam measures.
I wouldn't care too much if the regulators go after the centralized cryptocurrency platforms though. They are not very transparent and can be easily abused.
No matter we have centralized or decentralized systems, scammer and hackers are intelligent enough to scam us. It is our duty to take preventive measures and be alert.