API is not a feature, it's a blood and air of the business. Why it's even considered situation when a large public business doesn't provide some API? Imagine a presentation that explains: breathing is extremly important for living, everyone who's not breath are dead now! And those who breathes are very alive! Bs.
I know this isn't reddit and I don't mean to be childish, but in case the creator of that slideshow will see this thread: slide 4 looks like somebody thinking about APIs while giving another person fellatio. You may want to rethink that slide.
We made it for helping people in big organizations and in startups to better understand ROI of APIficiation of a business. New distribution models, scalability and architecture, open innovation
The "building bricks company" or the "API driven company"
My IT infrastructure is Amazon
My CRM is Salesforce
My Storage is Box.net etc...
Lots of players in API economy
You have API managements solution : Layer7, SOAsoftware, APIgee, Mashery, 3scale and plenty of new ones.
Then you have API distribution channels with market place and automation platforms : Mashape, Zapier, Apiary Temboo, elastic, IFTTT, Webshell
To my mind, this is all API economy which is addressing this point.