Criminal activities due to Crypto is a really serious matter in today's world.
$400 million worth of XRP had been used for “illicit activity.” This represents just 0.2% of total transactions, something which Elliptic suggests makes the vast majority of activity “legitimate.” Thus even the governments around the world pay heavy attention to crypto wallets and exchanges.
one-quarter of Bitcoin users and one-half of Bitcoin transactions are associated with illicit activity. Around $72 billion of unlawful activity per year involves Bitcoin, which is close to the scale of the U.S. and European markets for illegal drugs.

But I personally feel with every technology, you will always have a positive and a negative side. And obviously we know how BTC is curbing the problems that many developing countries are facing.
Heavy taxes, duties and tussle between the countries affect so many people around the globe. Cyptos solve the problems in many aspects.

Infact mining of crypto is one aspect where there's little to no criminal activity involvement, rather the use of sustainable energy sources makes it more favourable to do. I use RRMine cloud mining services and can tell for sure how clean the procedure to mine and market cryptos is.
I've earned a couple of grands using this and it surely is a good source of passive income.