The empirical evidence seems to point that way, a lot of people were noticing that many of the Google stuff became open source or got open source equivalents from Google (Borg/Kubernetes, Blaze/Bazel, etc.) only after a critical mass of former Google employees left Google and since they liked Google tooling started replicating it as open source software outside of Google. In some cases that open source software got traction and Google seemed to be falling behind in some areas.
Which basically tells me that in the software world, you can't really have trade secrets. I could be wrong, though.
The empirical evidence seems to point that way, a lot of people were noticing that many of the Google stuff became open source or got open source equivalents from Google (Borg/Kubernetes, Blaze/Bazel, etc.) only after a critical mass of former Google employees left Google and since they liked Google tooling started replicating it as open source software outside of Google. In some cases that open source software got traction and Google seemed to be falling behind in some areas.
Which basically tells me that in the software world, you can't really have trade secrets. I could be wrong, though.