This may seem a bit strange because this feature is supposed to be available even to those who are not registered, this would be useful as a promotional feature that would bring more traffic and this would certainly increase the chances of getting new registrants. However, it seems that Duelbit wants to motivate the streamers to place bets and therefore requires the user to be registered on the platform and have enough deposit. This may not lead to an increase in the number of bets but it does determine the type of users who will want to follow the stream.
So talking of traffic generation to the casino, I think this feature can only give low to nothing in traffic generation, most cryptocurrency casino are even lacking behind in implementing this features on their casinos.