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I don't think we see a new contest.
IMO, they could be collecting some data for boosting new player. The only focused they need do is, repaired some few news things from the feedback (included withdraw feedback from other users in this feedback. Perhaps, boosting promotion.
Maybe hire a few streamer deals, to boost a new player. As we can see, in recent bettings there is no movement are quite fast enough and just coming from one user. From my perspective is quite concerning, sometimes casino business are tough especially for new one.
Competition among online casinos is becoming really tough. You'll only last in this industry as an online casino if you have a lot of capital and are truly willing to promote, like what big online casinos like stake.com and BC.Game are doing.
You can see their ads everywhere, whether in sports events, crypto explorers (like Etherscan) and social media influences/ambassador. And like you said, they hire or sign contracts with streamers. But for sure, even these small contests here in bitcointalk can somehow help their marketing. And there could still be profit if many have joined.