It’s being instituted and it will be a $10 minimum.

“In the near future we plan to introduce a minimum payout threshold of $10. If you don’t make at least $10 in a given month, we’ll roll over the balance to the next month until you meet the minimum threshold. For example, if you make $5 in September and $5 in October, we’ll roll over your September balance into October. Stay tuned for more details.”

https://blog.medium.com/evolving-the-partner-program-2613708f9f3c