Agree that being anonymous makes it more comfortable especially in the world of gambling, maybe this is also the reason why many players who hide their usernames at the casino, can see on the list of winners of the $250,000 lottery
https://roobet.com/winter-wonderland-raffle there are 25 winners and only 8 players whose usernames are displayed the rest are hidden.
Casino gives options to display or hide username and people are free to choose usernames for their accounts. You can choose username that does not relate to your real name or usernames of your accounts on other platforms, other casinos.
Gamblers on Roobet will support a feature to change username or displayed username if the casino allows it. I meant each user has a permanent username but their displayed username can be changed.