Unlike their close relatives, horses & donkeys, zebras have never been fully domesticated. Humans have never widely used them to meet their needs.
Zebras evolved in the African savannas alongside some of the fiercest hunters, like lions, leopards, and hyenas. They evolved highly aggressive defensive strategies that make them nearly impossible to handle.
Zebras have a very strong kick that can even break a lion’s jaw during a hunt attempt. When they bite, they usually don’t let go, & they inflict serious injuries.
Zebras are also difficult to breed in human captivity, as they are highly sensitive to stress. There have been cases where a few zebras were trained for human use, but they were never able to reproduce trained offspring.
When Europeans colonised Africa, they needed draught animals that were immune to local pathogens & diseases. Attempts were made to domesticate zebras, but they were found to be too unpredictable & difficult to handle.
Efforts were also made to cross male zebras with female horses to produce zorses, so that the offspring would be as strong as horses & also immune to local African diseases. However, zorses were sterile & could not reproduce.
This zebra earned his stripes that day.