The only thing I can think of is codespace caching, that is a paid-only functionality that caches GitHub codespaces (basically vscode on the web) so that it takes minimal time to launch. But I don’t know if any member is actively using codespace. Also, we are essentially buying a development environment for contributors through this service, which may be prone to abuse.
Other than that, (for public repos) GitHub Actions is free (and there’s currently no reason to use any advanced runners), Github Pages is free, the base GitHub functionality as source code management and code review is free, GitHub package is free if we are interested in Host docker images for cross-compiler CI test - #5 by river . I can’t think of a good reason to get a paid org account.