If you will allow me to play devils advocate. I have very little faith in the mental faculties of my fellow man. Consequently I find it hard to believe that dash failed to gain traction on the darknet markets it was introduced on as a result of any sort of technical understanding on the part of market actors. Meaning, to most of them, monero is going to appear indistinguishable. What reason do we have to believe a private currency will gain traction this time when it failed last time?
Dash uses its own version of Coinjoin, which DNM were already using to tumble.
But Dash's version has far less volume, so mixing takes hours or days.
And most DNM ops understood it was instamined.
Awareness of fungibility, block size, hard forkability, and the dangers of bad crypto (thanks DAO) are at ATH. XMR was already on the anon community radar since Shen broke Shadowcash, if not earlier.