Well, this is possible to happen because most of the nations are now creating and improving their regulations policies to ensure that Bitcoin currency will not be use in illegal activities which is really very effective. KYC alone although a difficult task but its proven effective in which people background can now be identified. I believed this is the reason too on why the demand of Bitcoin and the crypro currency is reducing because some of it are formerly owns by the illegal people.
Exactly. The main factor behind this curbing of criminal use is the regulatory movements that we've been seeing. Everyone hates KYC but in the end it helps to make the crypto community more trustworthy overall. There were too many dirty associations with Bitcoin and criminals in the past that we need to have clear image. When there aren't criminal associations, regular investors will see it as less of a risk.
I don't think that we can completely eliminate criminal use but can at least keep a limit on it. They will always find a way to use it without validation.