Yeah, that could be it. But in a lot of cases Google is writing its own stuff for real reasons. Maybe I'm just older / have been in more diverse parts of indu

Yeah, that could be it. But in a lot of cases Google is writing its own stuff for real reasons. Maybe I'm just older / have been in more diverse parts of industry, but I've literally worked at employers where open source software was verboten (this used to be quite common even). Compared to that, my use of dozens of open source libraries on my current project at Google is open source heaven. Sure, a smaller startup might be using even more open source libraries because they don't have the resources of Google to write stuff like Monarch/Panopticon for internal use, but to my eye that's orthogonal on the issue of open source friendliness.