Aha I think you mean Rails, there can't be anyone left using it for anything outside of that.
https://www.guru99.com/images/1/021020_0523_PythonvsRub1.png
This chart alone should be telling. Ruby has more learning curve, smaller set of libraries and stable but slow rate of innovation. The returns aren't that great for something like Python developers who can be trained on most tool in its ecosystem.