Also: if the CDN for some reason is non-functional it impacts the reliability of your service. That might be a short outage or a complete shutdown of the server.

Unless you plan to monitor that stuff constantly and unless you tested your program with single components (or all possible permutations) missing, hosting these yourself might be the better option anyways.

Additionally your users don't signal their visit of your page to a hundred other servers which certainly isn't the most trustworthy behaviour.