That's a nice question. I think viruses evolve naturally in bats whose immune system is highly antiviral. So, the spillover of viruses from bats to other animals (with weaker immune system) results in diseases. More information here if you are interested.

https://medium.com/@shinjieyong/covid-19-was-a-ticking-time-bomb-scientists-warned-since-2007-c082b40a025a?source=friends_link&sk=2ae4124112f05d748a2b758a8b382953

At the same time, I'm not sure where bats may obtain the 'first' coronavirus too.