It is highly likely that these fungi don't grow unassisted. They aren't likely to colonize in your wiring, for example, without significant help and ideal condi

It is highly likely that these fungi don't grow unassisted. They aren't likely to colonize in your wiring, for example, without significant help and ideal conditions, such as a great deal of starting spores all over the wiring and lots of water and a good dose of additional nutrients that the fungus needs to grow. In other words, if you shred your wiring and put it on top of a pile of fungi that are bred to eat this type of plastic, they'll probably use rainfall to extend their mycelial network and eat the plastic. But if you just park your car next to the pile, it's probably never going to colonize your car and digest its electrical system.