I download MP3 podcasts when I have Wi-Fi to listen to when I'm offline.
I just download them onto the hard drive. I don't have an iPod or phone or anything else attached to the Mac, either by cable or BlueTooth, etc.
When I doubleclick on the MP3 to listen to it, iTunes starts up and I've noticed there's first a message telling me that it's copying the MP3.
Why? Where is it making this copy? Can I disable it? I don't need two copies.