"Shared source" comes from Microsoft's initiative, back in Ballmer's days when they were attacking Linux with FUD campaigns and patent threats (which continued well after their "Microsoft changed" marketing campaign).
The software industry called their initiative for what it is. Whether it's "shared source" or "source available", it's a poisoned gift. In the case of Microsoft's shared sources, this was because it was opening up readers of that source to the possibility of patents lawsuits. I remember for instance that Microsoft was making more money from Android, by threatening phone makers with patents, than they did from Windows Mobile.
https://en.wikipedia.org/wiki/Shared_Source_Initiative
The software industry called their initiative for what it is. Whether it's "shared source" or "source available", it's a poisoned gift. In the case of Microsoft's shared sources, this was because it was opening up readers of that source to the possibility of patents lawsuits. I remember for instance that Microsoft was making more money from Android, by threatening phone makers with patents, than they did from Windows Mobile.