In the audio community it is actually very common for shared source designs to be patented and/or distributed under non-commercial restrictions. I think this is

In the audio community it is actually very common for shared source designs to be patented and/or distributed under non-commercial restrictions. I think this is because many of the best (known) designers actually build, design and maintain the devices professionally. This might be unlike general electronics/software engineers that do not usually make money off their oss ventures.