Why does Spotify Monthly Listeners (SPML) statistic change after a while?

Spotify Monthly Listeners (unique listeners) are updated every day and calculated under a rolling window of 28 days. That's why possibly the Monthly Listeners figure might under expectation, especially when not enough unique accounts listening within that period and the subtractions of the statistic counted out the new 28-day period. Due to that feature of SPML, we can't guarantee final target number of the campaign.

Just refer to the chart below to see how SPML statistic works and feel free to contact us for further assistance.