https://www.polygon.com/2018/4/11/17223662/steam-spy-valve-privacy-settings

Steam Spy, one of the most-used analytics tools for Steam, created in 2015 by Sergey Galyonkin, will no longer be able to operate in part because of Steam’s new privacy settings.

Galyonkin tweeted about the conundrum he found himself in, addressing Steam’s new policies, which now make users’ game libraries private by default. Steam Spy operates via the ability to scan through millions of public game libraries and extrapolate information used to provide analysis reports on game sales and user data. Now that game libraries are private by default, Steam Spy won’t be able to operate.