I’m going to go out on a limb and say that you should just have better survival instincts than a toddler and not let the line wrap around your neck. And if you do have toddlers, maybe keep them away from the hanging machine.
Products in the real world need to be better than that
There are plenty of things sold that toddlers can kill themselves with, this is why parents have to spend ages 'toddler-proofing' their house. Same with dogs - supermarkets sell lillies but I can't have them in my house as I have a hungry dog that eats anything.
It's OK to have products which are not suitable for people with pets or kids.
Tldr have you met people? There's a reason seat belt laws exist. If we're going to let companies sell things to this population we've fostered and not take our own responsibility, we have to put it on the companies.
A quick browse through any of the shock content subreddits will reveal a lot in terms of average people's understanding of risk.
As far as dyi projects go... This is harmless
It sits several feet above the ground and is attached to the ceiling ffs. Unless you have the world's most clueless toddler who waits for this to fall just to sprint full speed at multiple ropes and you just so happened to install the winches with concrete bolts it seems pretty unlikely.
The toddler:robot win ratio is gonna be like 100:1.
>The toddler:robot win ratio is gonna be like 100:1
is beyond unacceptable for a consumer product.
My point remains that even a toddler would reliably beat this in a fight.