Without having a raft of data in front of me, you'd have to assume that many Large Development Shops had an Instagram API token and are being impacted by this change in addition to independent developers. The irony is that Instagram themselves felt this burn from a 3rd party provider back in the day when Twitter yanked their API access[0]

[0]: http://techcrunch.com/2012/07/26/no-api-for-you-twitter-shut...