I have iTunes, you know. Works in a similar way. Liking the convenience, but want to know that a popular hub accepting inbound connections and open to third-p

I have iTunes, you know. Works in a similar way. Liking the convenience, but want to know that a popular hub accepting inbound connections and open to third-party publishers has some sort of security built in, OS or otherwise. They seem to be going around the OS, and I don't think it's necessary.