Bats are diverse. There exists 1423 known species, with considerable sequence variation in viral receptors (eg DPP4 and ACE2) increasing the likelihood that mere exists a coronavirus variant that spilling into humans. 
https://twitter.com/abledoc/status/1353371016618143744
DPP4 is the receptor for MERS while ACE2 is the receptor for SARS. The variation in these receptors among bats greater than that between humans and other species of mammals. We still don't know the identity of bat species from which COVID19 came.
Bats have exceptionally long lifespans for their size. Bat Immune system has adaptations that allow them to harbour viruses without getting ill. They have constitutive activation of interferon pathway while other pathogenic pathways are reduced.
https://twitter.com/abledoc/status/1353371016618143744?s=19
Most importantly, the decreased activation of inflammasome pathway in bats probably explain the lack of pathology from coronavirus infections in bats. Viroporin induced inflammasome activation is a key process in a COVID19
https://twitter.com/abledoc/status/1353371016618143744?s=19
Colchicine that blocks NLRP3 inflammasome (it's a treatment for Gout and FMF) has now been proven to reduce COVID19 induced mortality as shown by Colcorona trials.
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