Here is one of many topics touching this idea already, some even have replies by the developers, like this one.
I even thought about spinning up a central resource server myself but the issue I faced wasn’t so much technical but mostly a legal one (like verifying authorship, handling licenses (possibly payment) and other legal difficulties that even depend on jurisdictions. Making the website is basically the easy part. Maintaining it and keeping it clean and legal is the bigger problem. Like it always is with user generated content, you have to meet certain requirements and can’t always simply weasel out with the “no warranty” clause of open source licenses. And that still doesn’t guarantee that people want to actually use it to share their stuff.