A properly designed device can't cause a battery fire with software alone, it would have to be hardware modified. Any EE worth their salt would know to incorporate a physical protection circuit, such as a DW01 with the two accompanying MOSFETs, into any li-ion cell powered device that can have a failure mode that overloads the battery.

Not saying that every EE is worth their salt though, especially regarding things bought online in places like Ebay, Temu, etc.