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The list is up to about 22,000 accounts. They get more free accounts everyday. IMO this type of way to reward users is a bad idea all around. If you're going to buy votes join @minnowsupport or some others that have bidbots that won't create spam.

These type of schemes have been flagged in the past by the community just like lottery and other vote buying/sharing programs.

I will make payments for previously created messages, I will not create new ones until this problem is resolved. I can create a list of bots, it's not difficult.

I can also try to compile a white list of accounts with which I can split the payment. I'll think about which option is better.