I do not find any follow up update about this plan so perhaps they are still working on something else which is more important than this feature. In simple way, I think duckdice and towerbet players can request to the admin to add dinabot. Dinabot is a bot where players can exchange coin or transfer fund from a site to other site. There are few sites only supported by Dinabot, so if the demand here is good enough then I have no doubt that Dinabot will be willing to be in duckdice and towerbet.
Thanks for answering it seems that I'm not the only one who thinks about it. It's my first time hearing that Dinabot I hope they would implement it in the future but yes it's not mandatory and they needed to focus more on some important things than this one.