For example at this link https://www.thesun.co.uk/tech/5092224/criminals-use-bitcoin-for-dark-web-illegal-activity/amp/.
So if there is nothing correct regulations, maybe a lot of countries will be block this payment system.
And as the effects, price of BTC will be drop soon.
So let's start to discuss, what it the right regulations to avoid Bitcoin used as a payment for crime.
Bitcoin is not a "payment system" like paypal. Bitcoin cannot be "blocked" by the governments. Bitcoin is designed to be sovereign money independent from the governments. OF COURSE bitcoin is used by criminals, by boy do i have a news for you: criminals use money and bitcoin is money.
As for what the right regulation would be is this: ZERO regulations, absolutely none regulations at all. But since the regulations won't work anyway, the governments can come up with any silliness they want.