This is why we need to scrape services like this and keep copies for posterity. For every site like this that can't sustain itself well into the future, a part of the Internet and its culture dies. RIP Soup.io
The "Imperial We", obviously. Goes along with "someone should do something ...".
It's true it would be nice to keep copies for posterity, but it's not realistically possible to archive everything created for all time.
OTOH, state actors like the NSA should be archiving lots of things like this, because "you never know ...". But, unfortunately for us, a meme from years ago nailed this: "My computer hard drive crashed. NSA won't send me their backup copy."