Cyberpunk 2077 blew right past that and kept going, with 1,000,297 concurrent players at the time of writing [Update: It peaked at 1,003,264, and is now drifting back down]. Of course, with CD Projekt's new RPG available on GOG, Epic, GeForce Now, and Stadia as well as consoles, the true number of people exploring Night City at the moment (or at least, trying to) is even higher. There are a million people watching it on Twitch too.
The current overall record for the most players in a game on Steam was set by PUBG, with 3,257,248 people simultaneously chasing a chicken dinner on January 13, 2018. But Cyberpunk 2077 has already sured Terraria's peak of 489,886 and is catching up on Dota 2 (1,295,114 players) and CS:GO (1,308,963 players).
By the way, if you're still looking at Steam's speeds in despair right now, it might just be that servers are overloaded in your locality. Go to Steam>Settings>s and switch your region to somewhere on the other side of the world. You're welcome.
And while you're waiting for that to complete, here are an atmospheric tour of Night City to watch.
