in number 3, did you mean "herbicides"
The thing is, I understand that some farmers were doing that, but some others were simply trying to grow soybeans, and they didn't use herbicides, but Monsanto successfully sued them into never saving "soybean" seed ever again.
Different take: seed genome is like a MP3. Piracy (illegal copying) is enforced based on IP. Seeds doing it "naturally on a farm" just means that you have grounds to sue the farmer for not stopping illegal copying.
Step 1: protect the IP protected seed genomes
Step 2: sue the crap out of people growing those types of plants who arent paying you. Edit: these are all soy beans including "public seed"
Step 3: increase the price now that you have a monopoly on that kind of seeds
Source: Monsanto and soy beans
don't forget the creativity like "deleted from the census" or "bought the farm" or "bit the dust", etc. There is a poetry to avoiding a filter.