Almost all jurisdictions allow businesses which cannot be held liable for all their actions. Imagine losing you house because someone decided to smother themselves in your infused cooking oil and light themselves on fire.
Businesses are made to make it easier to share profits and responsibilities when trying to fulfill users wants. Laws are made to offer protections for consumers (because nobody has time for common sense), but at the end of the day the consumer has to take responsibility or no products can be made. If you're too fat for a chair, it's on you to find or make one that works- not every product is for every person. Laws only stop chairs being sold that are too dangerous for anyone.
Businesses are made to make it easier to share profits and responsibilities when trying to fulfill users wants. Laws are made to offer protections for consumers (because nobody has time for common sense), but at the end of the day the consumer has to take responsibility or no products can be made. If you're too fat for a chair, it's on you to find or make one that works- not every product is for every person. Laws only stop chairs being sold that are too dangerous for anyone.