I'd expect their S3 data transfer pricing to be closer to the assumed $0.02 CDN price. The price available to the public goes down to $0.05 once you hit 200 TB,

I'd expect their S3 data transfer pricing to be closer to the assumed $0.02 CDN price. The price available to the public goes down to $0.05 once you hit 200 TB, and AWS is known to give significant discounts to large clients. The storage cost is a good point, and I don't know which CDN they use, but I expect the songs that weren't "hot" would be evicted from edge caches pretty fast, so that should be no significant increase. To put things into perspective, an article from 2009 estimates that Spotify used 84TB of traffic per day[1], back when they had 5 million users. Soundcloud claims to have had 40 million registered users in 2013 and 175 million unique monthly listeners in 2014. These numbers aren't easy to compare, but either way I think it's safe to say that 900TB should be a small fraction of their monthly traffic, and shouldn't make a huge dent in their financials. [1]: https://www.theguardian.com/technology/blog/2009/oct/08/spotify-internet https://www.theguardian.com/technology/blog/2009/oct/08/spot...