A Linux distribution usually has very few (but large) projects:
- the package repositories (debian’s APT repositories)
- the installer
- the documentation
With 20k+ packages, you need hundreds of volunteers, who often work on the same repository/project.
Haskell does not have that structure. Hackage is not a coordinated repository in any stretch of the word. It’s just a place where people upload stuff. It’s a central resource, but the contribution structure is decentralized and uncoordinated, with no one really inheriting any responsibilities on account sign-up (other than not abusing the platform).