system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we use rubber belts for cars, driers, treadmills, vacuum cleaners etc. when used with motors instead of using chains like those on bikes and motorcycles. Wouldn't they last longer?
gpt
Chains only last longer than belts when they are inside an enclosure where they can be kept clean and lubricated. 
In an exposed application a belt will usually last longer and needs less maintenance. 

 In all of the products mentioned a chain could be used, but would significantly increase the manufacturing costs.  Belts work well enough.