Calling for stricter regulation of treadmills because children have been injured by them is like calling for stricter regulation of kitchen knives.
They are both items intended for adults. Any injury a child sustains from them is likely because the parent wasn’t supervising them or didn’t take proper measures to prevent access to it. You wouldn’t let your child rummage through your knife drawer at will, so why give them the opportunity to stick their hands into treadmills.
Common sense alert folks: Place your treadmill in a room your children can’t access. If you don’t have a spare room, make sure you know where your kid is when you are using your equipment.
Companies should manufacture safe equipment, but treadmills are designed for adult operation. If we need to start making every piece of equipment child safe, tell Harley Davidson I have a great design which incorporates training wheels.