Americans would rather mention TF2, a game with less than 10 thousand concurrent players and probably making a modicum of money, than ever pretend that game exists or has influenced other games.
Regardless of how many concurrent players it has now, TF2 was massively influential to other FPS games, and it's still held with high regard by the community. It was also one of the first major games to introduce loot boxes.
TF2 has over 30,000 active players right now though..