Over on Reddit, eagle-eyed players have spotted that this game is seemingly just a tool for its creators to install malware ...
Razer Nexus is a new local game streaming app that's completely replaced Steam Link for me, with better performance and compatibility.
Steam says its likely your PC was infected with malicious code. Luckily, the scope of the situation was small, relatively speaking: It appears only about 1,500 people actually downloaded the game ...