TL;DR
Your monthly funds renew based on the date you activated/created your Streaming Reward card, not the calendar month.
Full Explanation
If your reward includes monthly funds, your monthly refresh date is tied to the day you activated (created) your Streaming Reward card 😊
That means it’s not based on the 1st of the month or a calendar-month cycle.
Example:
If you activated your card on April 7, your next monthly refresh would be May 7.