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In other sites, like "Stake"
Even if they put a captcha, still the code can be claimed in under 1-2 mins. Don't hope too much for codes are being shared on social media, that's why I never following a event code drop on social media.
I think, from live-stream our chance more good rather than social media.
Good point to compare, even the one in required specific number of wager amount in order to be eligible for to claim the code. So it is reasonable if the one in duelbits also fully claimed quickly although the amount of the code and the requirement are different. It is better to follow competition or contest than hoping for bonus code in social media although participating in contest requires starting bankroll but it is much better and more challenging than hunting for bonus code.