If I don't care on spending lots of UTXO in one shot, reusing addresses, mixing coins, coinjoining etc., that doesn't necessarily mean that Bitcoin is bad for criminals. Lots have been caught and it's generally not a good idea if you're going to do something really bad, but it depends from whom you want to hide. Is it your wife or your employer? They aren't going to find out much if you use Bitcoin. Is it the government? You're screwed.

However, I read that those two kept the private keys of the 119,754 BTC to a cloud server. I highly doubt they were cautious enough. Also, this doesn't make sense: