Discord, or the Death of Lore.

When the free image-hosting site ImageShack made the realization that they were losing buckets of money hosting images for free, and shifted over to a subscription model that also cut off legacy accounts, deleting them in fact, the question was who would care.
(…)
It turns out, in the breadth of time, ImageShack was the unofficial official clearinghouse of diagrams and illustrations of web discussion boards that had limits (or difficulties) hosting images. (…) This was very helpful for technical diagrams and explanations that would cover (at the time) larger resolutions of graphic information.
(…)
So, when ImageShack killed what had been 13 years of these illustrations, they definitely probably saved the business, and they ensured everyone who was hosting with them was truly engaged, but they also lobotomized hundreds, possibly thousands of forums and discussion groups and absolutely wiped an entire collection of reference documents from the web at the same time.