The market (job vacancies) seem to imply otherwise, I rarely see it mentioned in comparison to Python, Go, PHP.
Conclusion: Ruby on par with php, less popular than Node but not by orders of magnitute, and used way less than Python. But comparing it to web development languages like PHP/Node, it's right there with them.
If anything Ruby is in bad form in mainland Europe (France, Germany, Netherlands) where for whatever reason PHP is king for startups.
Now for frameworks: Rails: 480 Laravel: 41 Django: 535 Symfony: 164
Conclusion: Rails is really up there with any other major framework. Could be that some job posts don't mention the framework, but I'm going with the data we have.
Some famous Ruby shops I know are from London: Deliveroo, GoCardless, Funding Circle, Babylon Health. I honestly don't see how this is bad.