What about a lottery by deposit in a certain period or have you found that the bots deposited?
At least one of them tried that but I don't think they will again.

I suppose what ever the suggestion to redistribute sadly will have a botting potential as it's something of monetary value.
The only thing that kind of doesn't have monetary value is the reward points.
1 Reward Point = 1 Satoshi. You can sell directly if you have more than 100,000.
I'm looking for something that can't be gamed by the botters.