Most feed readers show the feed summary. Most of them don't allow you to set or even use a web view. But what happens when your feed is a webcomic? You don't get the image, you get a reduced, illegible image or an image with the webcomic logo instead the current page.
GatoReader is for those cases where you want to see the actual web page, without the need to check each one manually for updates.
These details are provided for information only. No information here is legal advice and should not be used as such.