I don't think BDFLs are a problem. Nobody questioned, say, guido design of python or matz' design of ruby as such. The issue here is primarily about who controls the ruby ecosystem. Interestingly python also had a somewhat similar discussion in the past; you can see this indirectly if you look at pypi:

https://blog.pypi.org/posts/2023-05-25-securing-pypi-with-2f...

See that question asked:

"Isn't supply chain security a corporate concern?"

He tries to bring arguments to invalidate that. And failed in an epic manner. Now people are more suspicious than before. Kind of strange to see, too.