Why is TF2 still growing?

This year TF2 hit a new all time high for concurrent players. So why are we seeing the game still grow after 14 years? And in Steam Charts really a reliable source for player numbers? And is this video title clickbaity enough?

00:00 Intro
1:35 How Many People Are Playing TF2?
7:33 Why is TF2 Still Growing?
10:06 Outro
12:20 Bonus Clip

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