I bet the shady dealings being carried out on the darkweb......with crypto....are about as many layers of abstraction as needed in the minds of the people carrying out those transactions? Also probably has a lot to with the liquidity of the most popular coins and knowing there will be more places to spend your litecoin than lesser coins?

I always have a chunk of my portfolio in Monero for this reason and as insurance if regulations really start to attack non-private crypto.