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well it's not a lot of time anyways
one retweet, or one quote retweet or something like that
will take less than one minute and can be done almost on automatic if you're rolling social media
but I do agree there are better ways to make contests excluding bots
retweet, or quote retweet or something like that very simple to do, but this simple action lead maximize bot participation.
They've to set some rules to exclude bots, so make sure we're participating as a real person.
I personally think that Duelbits should step up with certain requirements when it comes to conducting giveaways on social media platforms, that are a bit harder for bots to meet.