Yeah it might the case that cyber criminals love crypto currencies but for the average criminal the education in IT and internet issue is probably very low and they will not trust any cryptos. I would assume that they will value cash always the highest, because they can see and touch it. Also when paying with cash you are more independent. When paying with cprytos you need internet access and government might track you.
That's right. Using cryptocurrency is one thing, and staying anonymous while using cryptocurrency is another. The ordinary criminals may jump in to use Bitcoin or Monero. But he may not be able to convert these cryptocurrencies to fiat or other physical assets. And he may not be able to keep his cryptocurrency transactions secure (i.e without any links that can be traced back).