He may have won the lawsuit but he lost in the end.
Schmeiser was actually a rapeseed (canola) grower and had spent years developing his own line of seed that he sold to others. When Monsanto's GM pollen contaminated his crop it essentially ran him out of the seed business because he couldn't separate the contaminate from his original seed stock and intellectual property laws gave Monsanto the right to shut him down regardless of whether he intentionally used their IP or not. So several decades of work by Schmeiser developing his own line of rapeseed were down the drain.