I use this tool every day at FB and it's awesome. I highly encourage you to try it and see if it fits into your workflow!
I am familiar with most of the other tools mentioned here (e.g. SonarJava) from my time doing Java development outside of Facebook and never had a collision in my head because this project is not actually a library or tool for Java. It's a standalone Electron app that works on iOS and Android for debugging purposes, the only Java part is incidental in the Android app (and could be Kotlin or C++ or whatever you want).
That's a bad example. Gerrit is not a new name for Reitveld, it's a totally new implementation (with similar inspiration). And both of those were publicly released under those names.
Your underlying point is quite true, though.