If everyone references the CDN copy, then most clients will already have the library cached and don't have to download it separately.
Personally, I self-host every dependency I possibly can, specifically because I don't want my website's functionality, performance, or security to depend on a third party insofar as I possibly can.
Personally, I self-host every dependency I possibly can, specifically because I don't want my website's functionality, performance, or security to depend on a third party insofar as I possibly can.