Tested (from usa):
It's a referral link, but not sure why would they redirect to them. It's indeed a possibility that cryptogames.io = duckdice.io = dicecoin.io
Ok I think now there is nothing to worry about duckdice, its not direct link to duckdice so dicecoin owner might have added ref link to duckdice to earn affiliate commision because duckdice is one of the dice site paying high affiliate commission. It's a referral link, but not sure why would they redirect to them. It's indeed a possibility that cryptogames.io = duckdice.io = dicecoin.io
I will keep playing on Duckdice.