How Does the Random Draw Work
Gleam automatically uses Random.org to draw winners, they offer true randomness. Here's an excerpt from Random.org explaining how it works:
RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs.
We currently draw winners based on actions, not unique entrants. This means that there is the potential for the same person to win more than once. If this happens you can invalidate the entry & repick that winner again.
Random.org has a number of certifications from different countries which you can view or request here.
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Allow Repeat Winners
When drawing winners you can choose to Allow Repeat Winners. Selecting this option will allow multiple entries from a single contestant to win prizes.