The real benefit of using one repository across multiple sites is that it increases the likelihood the library is available from the browser's cache. DNS lookup and retrieval will need to happen the first time a visitor goes to a site with a CDNJS library. If that same visitor visits another site that uses the same library then the library can be fetched from the browser's cache without any DNS or download latency. In other words, the more sites that use CDNJS, the bigger the benefit to the whole CDNJS community.
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The real benefit of using one repository across multiple sites is that it increases the likelihood the library is available from the browser's cache. DNS lookup and retrieval will need to happen the first time a visitor goes to a site with a CDNJS library. If that same visitor visits another site that uses the same library then the library can be fetched from the browser's cache without any DNS or download latency. In other words, the more sites that use CDNJS, the bigger the benefit to the whole CDNJS community.