... because until now the CGCX exchange has not been listed in CMC
CMC didn't listed any new exchange in last six months.
We are still in negotiations and for us it seems like we are close.
maybe you missed a few of these exchanges:
The aphelion exchange, added in CMC in January 2019
Binance DEX, added in February 2019
and Binance Jersey added in CMC in January 2019.
I hope the CGCX exchange will be immediately listed in CMC