I'm also curious how you're doing this. One of my apps heavily uses the Spotify API and Spotify has started to get very strict on who uses their API and if/how they are allowed to monetize.
I haven't had any issues from Spotify API yet. I've had days where it's been slammed pretty hard. YouTube has the most strict quotas, but you can apply to have them increased which I've done several times.
Great point! Wrong choice in words; will edit the post to make better sense. Also looks like someone else edited the title of this post on YC. Any idea how to change it back?