Long time lurker, felt like it was time to make an ass of myself.
To be quite frank, I find it extremely annoying when artists remove content from e621 when the same content is available in the same resolutions at the same qualities on other sites. All they're doing is depriving people of an easy way to search the content.
Now obviously, if they don't want e621 to host this content, that's up to them. They own the art and they can do whatever they please with it, including attempting to selectively remove it from the internet.
What I'm thinking of doing is creating a site that pulls data from e621 about a post's last known source + last known tags. That data would be used to display the content from other sources (such as furaffinity) without me ever touching the image data itself. There are many ways to do this, ranging from fetching the FA page on the server and delivering the current content url (d.facdn.net) to simply using an iframe (would be uglier, but no way for FA to block it). All I'm interested in doing is allowing users to search through the posts using e621's tag system.
I'm curious as to what people think of this idea, and more importantly, if anyone can see any immediate legal issues with this idea. I'm of course not asking for any endorsement from e621 or any of its members.
*EDIT* Re-reading this, it's not as clear as I want it to be. I want to reiterate that I would not be hosting any content and wouldn't be allowing users to bypass patreon or other similar systems. It would simply be displaying publicly available content on another site.
Updated