Zuban maybe doesn't succeed in terms of the amount of users, but it's nearly finished, supports the full Python type system (I'm in the process of completing the conformance tests), has support for Django and LSP support is also pretty much complete. So in a technical way it did already succeed.

It might not be used as much, but to be honest I think that's fine. I'm not a big VC-funded company and just hope to be able to serve the users it has. There's space for multiple tools in this area and it's probably good to have multiple type checkers in the Python world to avoid the typical VC rug pull.

For real. I consider myself to be “into Python typing,” and yet I had no knowledge of Zuban before the parent comment and a very faint memory of Jedi.