It's not random, and as a moderator/community manager, you probably don't have any more information on the subject, but as someone who's very active on the French chat, especially at night when there are fewer people, I've noticed that statistically, there are factors that make the distribution non-random. Having 5-6 per night for a week, then nothing for several days with the same activity level and the required stake to be eligible, clearly proves that it's not random.