This article misses the biggest cost Spotify have at GCE - analytics. Spotify has migrated a 90 PB Hadoop cluster running on 2000 servers to GCE. That cluster was running Hadoop jobs (mostly Hive) 24x7. The YARN job queue was always full. They now have to pay for the storage and processing costs for that. How much will they pay? I don't know, but I know from their history they are very good at getting discounts on infrastructural software (e.g., their Hadoop software was licensed from Hortonworks and they got an incredible price, because Hortonworks needed a reference customer - sound familiar?)