AVM warns of restrictions for proprietary kernel modules:
The consequence for AVM would be to stop supporting Linux. A reaction to the email is not yet available. The kernel developers are likely to be little bothered by AVM's threat, as their goal of keeping the kernel and its entire environment free seems to take priority due to their mixed experiences with proprietary drivers. Alternatives to AVM exist, and GPL drivers for AVM hardware are not excluded, even if they do not come from AVM.
Exactly that: Alternatives exist. It's time for the alternatives to pay off with better Linux support - then maybe AVM will also become reasonable. The binary modules without source cause more trouble than joy.