There is no reason to trade on these dex though, you are going to end up paying extra on all those fees. Deposit to Rollbit directly using the lowest fee deposit option then purchase RLB onsite. Most RLB trading volume is also onsite plus you could always store those RLB in Rollbit or pretty much put them in the liquidity pool if you have enough of it
Yes it all depends on how they trade, maybe it's better in your opinion and buy or keep it on a rollbit account, but there are also those who actively trade on the Dex exchange, obviously the drawbacks of trading on the Dex exchange use more transaction fees so it's better on the rollbit site to buy if there is, I haven't seen any Cex exchange for RLB wouldn't that would be great to increase trading volume too if they were listed on Cex.
I might be interested in investing and trading RLB if they are added on the biggest Cex exchange site I think rollbit could actually propose that to add a Cex exchange site for their token or indeed they focus more on development and their gambling site only but so far RLB also quite a good investment.