Because big corporations buy the exact same things, you just market to them differently. Throw in various kinds of support contracts and "enterprise" whatever and you make much better margins off of the corporate contract even if what you are selling is pretty much identical.
The point is that Akamai is probably correct that all Linode really needs to change to be seen as viable by large corporations is the marketing. Its incredibly dumb that the world works like that even at the scale of large corporations that you would think would care less about being marketed to, but my experience has been the opposite / being tickled by marketing is even more important for big corporations.
It should also be noted that the people who choose infrastructure vendors are rarely the actual sysadmins in charge of the infrastructure. These kinds of decisions are standardized across large organizations (sysadmins would never be able to agree on something like that let's be honest) and the choices tend to be made by people who haven't set up a new server in a decade, (if they've ever done so then they are more technical than most in charge of IT purchasing).
