I wonder how much data you could encode in an RSS feed and therefore retrieve from services like Feedly? I remember reading a while ago about movie piracy site

I wonder how much data you could encode in an RSS feed and therefore retrieve from services like Feedly? I remember reading a while ago about movie piracy sites that would store chunks of encrypted video inside images and host these images on services like Google Drive, and then client side download these 'images' in order to reassemble a film. I wonder if a similar thing would be possible with and RSS feed? Feedly seems more than happy to store the entire content of every post I've made!