Could be that it's a bit harder to get started with?
You have to configure your "environment" for it correctly - with a script that installs the dependencies etc before the container starts running. That's not an entirely obvious process.
Good point. The environments I’ve set up have been pretty easy but I’ll admit that at first I was very annoyed that it couldn’t just use a pre-existing GitHub action workflow.
Edit: environment setup was also buggy when the product launched and still is from time to time. So, now that I have it set up I use it constantly, but they do need to make getting up and running a more delightful experience.
Also, Codex Cloud and similar services require you to give fully access to your repository, which might trigger some concerns. If you can run it locally, you still have the control, same development environment, and same permissions.
It doesn’t have access to your repo when the agent is running (unless you give it internet access and credentials). The code is checked out into the sandbox before it’s let loose.
You have to configure your "environment" for it correctly - with a script that installs the dependencies etc before the container starts running. That's not an entirely obvious process.