Might be a one in a million chance. Probably less, because we only heard of two cases. If you drive through London, you will see people taking much much bigger chances with their lives and others' lives for much less gain; and the same is probably true anywhere you drive.
I bet if I offered you a genuine charger for free but you have to drive 20 miles in your car to pick it up, or you pick up a cheap charger in the shop next door, you are more likely to die driving to pick up the genuine charger.
You won't likely be killed by a knock off charger, no. But if that's how you live your life, making those compromises in other areas, you'll eventually stack up hundreds of such compromises and one of them will harm you.