This some exchanges reject coins that come from bitcoin casinos which means that not every coin is treated the same, that hurts fungibility, so the coins need to be untraceable if there is any hope for one of the most basic characteristics of money to remain.
Can you, please give some examples ?
This can only happen when exchange know casino wallet. if casino uses freshly made wallet then is impossible for an exchange to know where that coins come from.
People are just not used to use Monero properly. It is same when cars come out. All roads were made for horse chariots, there was no gas stations or mechanical workshops to repair your car. As a driver you were forced to use mentality and infrastructure of horse chariots. It took some time that we now have highways where you can drive safely at 130 km/h.
Monero is actually solving this problem since it is fungible. Exchanges will reject Bitcoins or Litecoins or Doge that will come from Casinos, so I guess people will start gamble in Monero.
https://monerodice.net/ is a good choice!