I recently wrote about hybrids of domestic cats with large relatives of the cat world, designed for home detention. Some people go even further and give birth at home are not hybrids and pure-bred big cats - cheetahs, bobcats, servals. So this is about the selection of such cases.
For the maintenance of the big cats as pets need a big house (apartment, even if it is large, in most cases will not work - you need fresh air), a lot of money for the maintenance of (raw meat, hamsters and rabbits will be devoured with the speed of the conveyor), patience and a lot of time on training, as well as the share of luck (not the fact that the beast will grow tame). It is good fun for the oligarchs.
Ryan Van Niuvenhuizen from South Africa throws at cheetahs to save the species from extinction: