The popularity of bitcoin is gaining first places not only among large companies and ordinary investors, Bitcoin also remains the most preferred coin among criminals.
Prosecutors Zia Farooqi and Jesse Brooks talk about it in their podcast

As it turns out, even though there are anonymous cryptocurrencies, criminals will still need to buy bitcoins to withdraw them into fiat money.
“You can buy a Tesla with Bitcoin. You can buy Subway with Bitcoin. You can’t buy them with those other coins that no one has heard of, and so as they still chain-hop to obfuscate, at the end of the day, they need to get this into fiat currency,” said Faruqui, adding that this is the “choke point where law enforcement will come in.” 

And since all transactions are very easy to track, there are good opportunities for law enforcement to catch criminals with Chainalysis.

https://decrypt.co/45715/why-cybercriminals-terrorists-keep-using-bitcoin