Key difference is those are un-powered treadmills.
I stand by saying having the machine powered near kids is already game over. They should maybe add a child-safe mode that requires an additional pin to activate, guards are a red herring here
Of course, I've never seen anyone attach the cord.
Kids of course don't know to use an emergency stop which is why I'm going on and on about maybe not being negligent parents and leaving kids near a piece of power equipment that causes 20k+ injuries a year...
But apparently that's a radical take for HN