Well if the intent is that Sourcegraph Core is "for teams of any size", and the code at https://src.sourcegraph.com/sourcegraph is the Core, then it seems like the LICENCE file in the source should be updated to reflect the intent and not say it's limited.
Sourcegraph CEO here. Thanks for the feedback. We are working on making this smoother/clearer, but the way it works is that the license refers to the posted pricing. The posted pricing on Sourcegraph.com says $0 for teams of any size for the non-enterprise features. When you exceed 15 users, there is also a license you'll receive that explicitly says that, but we wanted to keep it simple when you are just getting started (and not require people to click through a EULA).
I guess I'm still confused on what the website says re: pricing and limitations of Sourcegraph Core, and what the LICENSE file in the source code repository says.
The LICENSE file starts:
Fair Source License, version 0.9
Copyright (c) 2015 Sourcegraph Inc.
Licensor: Sourcegraph Inc.
Software: Sourcegraph Core
Use Limitation: 15 users
...
But I think "Sourcegraph Core" is described as teams of any size on the website.
From other comments, I gather that (to make things as confusing as possible) Sourcegraph Core is released under the Fair Source License with a 15 user limitation, but the fee for > 15 users is $0/user, so its basically a free (gratis, not Free/libre) shared-source model.