Just explored kikabet a bit today and I noticed that there is something uncommon especially about the hidden feature. Users may hide their usernames in the all bets feed and weekly race leaderboard but it seems to be useless since the usernames are revealed in the general leaderboard information (Daily, Weekly and Monthly). The general weeklu leaderboard is exactly the same as the Weekly Race leaderboard, so it is basically killing the main purpose of the hidden feature.
It can be a bug and I believe it is not too difficult for Kikabet team to fix it. Perhaps, it does not match with each other well but it can be solved by Kikabet after they received your report. As privacy has to be universal at their casino, not only possible with weekly race leader board while it's public with general weekly leader board.
Your finding and responsible report to Kikabet team is very helpful for user community too, especially users who care about their privacy.