Although comparing Reddit to fascists is ridiculous, your argument isn’t quite right, either.
Reddit IS taking something very finite: people. There’s only so many people in the world using this type of social media, and an overwhelming majority of them stick to one platform.
If Reddit just went belly up, Lemmy would have increased traffic.
One has a one in a million chance to kill you. The other has a 100 in 100 chance to cause you severe health issues in the longrun.