Currently, the ratio of legal to illegal activity on the bitcoin network has completely changed trend as the former surpasses the former. This was stated by DEA Agent Lilita Infante at the U.S Drug Enforcement Administration.
Is the number of criminals on the bitcoin network has significantly reduced compared to early days?
https://coinpedia.org/news/bitcoin-network-speculators-not-criminals/Yes i agree with you. The speculators want to make quick profit from market movements.
They even can manipulate the market to get more profit by buying the low price after they dump.
I think not much criminals exist in cryptocurrency, other than scam icos and projects.