I've never used imageshack, thankfully
Yeah this. I never liked them from the beginning. As far as I know, they were the first image host that I knew that crammed ads all over their site, and also the first one I know that's been breached. And now they're the first one to replace old images with ads. I'm not surprised at all.
Too bad imgur is doing stupid stuff too, but at least not like, photobucket level of stupid stuff.