Did those owners pay their ~~protection money~~ don't light my house on fire subscription fee? /s

Apparently it has to do with the starter. From the article:

According to BMW, water can enter specific areas of the starter in the affected vehicles, causing corrosion. This could result in the engine failing to start.

In some cases, a short circuit could occur, leading to local overheating in the starter. "In the worst-case scenario, this could potentially result in a vehicle fire," the company warned.