Because it shows many people are playing it. That in itself may be of interest to people who are considering purchasing the game. Also it let’s the devs know there is a market potentially interested in DLC or sequels. If the news was that player counts dropped to a very small number, neither of those things are likely to happen
It’s not like she’s forcing anyone to listen. I agree that she’s a moron, but I don’t understand the celebrities shouldn’t have freedom of speech take.