There is more competition, but IMO we should only count those games with more than, lets say, 50k sales.4. Competition: There is more competition on Steam. There are more games per user & less users per game now than there were 10 to 15 years ago.
This, on the other hand, tells that Steam is a dominant platform for personal computer game publishing. Everyone is publishing their games on Steam, because that is where 85% of the PC game revenues are coming from.In 2010, there were 2,450 user accounts per game. (2.7m user accounts, 1,102 games on Steam). In 2010, Civ V had the highest peak out of any game. It would be 41st in 2025.
In 2016, there were 1,105 user accounts per game. (12.5m user accounts, 11,309 games on Steam). In 2016, Civ VI had the 4th highest peak out of any game. It would be 20th in 2025.
In 2025, there were 329 user accounts per game. (39.3m user accounts, 119,644 games on Steam). In 2025, Civ VII has had the 38th highest peak out of any game. It would probably be higher if it's launch wasn't split between 2 dates.
This is not to counter "there is more competition" argument, because there is more competition. Only recently, I found out that Manor Lords, which was a debut game from a small indie studio, sold 1M copies in a week and 3M after 9 months. Their publisher, Hooded Horse, seems to be a rising star. They are also the publisher of Old World.