I fail to see how RSS feeds can't still use cookies? Once you've got a cookie then the feed can easily add tracking links or a unique mp3 file with personalised

I fail to see how RSS feeds can't still use cookies? Once you've got a cookie then the feed can easily add tracking links or a unique mp3 file with personalised ads inserted. It's trivial to do this with a web server. Edit: This assumes using a web browser to access the feeds. Obviously cookies won't be kept with an app.