This is a nice theory. In Germany, if you are the owner of a SIM card associated with a crime, it is well possible that a prosecutor will consider this sufficient for a warrant, and the police will visit you early in the morning, taking away all your digital devices for something between three months and some years.

Like I already said: just because you aren't already on the hook for it doesn't mean that you won't be legitimately suspected of the crime in the first instance.