Across Twitter on Friday, open-source advocates and academics alike poured one out following the suspension of Sci-Hub, a site that lets researchers bypass the costly paywalls for more than 70 million papers from across the globe.

If you haven’t heard of Sci-Hub, here’s what you need to know: Back in 2011, a computer programmer named Alexandra Elbakyan created the site as a way to give researchers—who are often forced to subside on crap salaries—access to papers that they might not be able to afford otherwise.

The most recent crackdown happened at the tail end of last year, when three major academic publishers filed a copyright infringement suit in India against Sci-Hub and fellow open-source site Libgen.