Yes. That is true. Cheetahs are very calm animals. They might seem like intimidating cats with their large teeth, a deadly stare, and that awesome sprinting speed but there are sides to cheetahs you do not know about.
Cheetahs have been traditionally used for hunting in the past. Infact, cheetahs were tamed by Egyptians for hunting and to keep as housepets. Sure cheetahs are not as tamable as, say, a golden retriever but if raised from a cub they are pretty friendly. Even if untamed, cheetahs would rarely attack a human. The fact is cheetahs usually hunt smaller animals and they are not the apex predators of their respective environments.
Tribes with cheetahs for hunting (Image above)
Cheetahs are also not very powerful hunters and the long association with humans, they have co-evolved with us. Even today, some African tribes use cheetahs as hunting partners. In Fact, wildlife sanctuaries allow you to pet cheetahs they have bred. Cheetahs in captivity are raised alongside dogs since they love socializing and this also makes them safer than other big cats.
Cheetah being raised alongside dogs (Image above)
P.S.: Do not think they are completely tame. They might bite you if they feel threatened.
Like any animal, those that are held in captivity are easier to tame than those that are in the wild. Many people even those during ancient times kept cheetahs and other big cats as house pets. They, of course, had to be tamed or they would attack people. Also, animals are easier to tame or train if they are young.
The younger the animal is, the easier that animal is to tame. Cheetahs can be tamed, but they can’t be domesticated. Therefore, they are probably not the easiest animal to tame, let alone the easiest big cat to tame. Other cats like lions are probably easier to tame because lion tamers do just that for circuses. They can get the lions to do all sorts of tricks.