Jani Schofield, the DaddyOFive kids, and Onision are the big ones for me.
Information gathered on the Farms helped remove Bodhi Schofield (and temporarily Jani) from their evil cunt of an MBP mom, helped remove Cody and Emma from the evil cunt parents of D05, and shed light on Onision's perverted faggotry. All the dramatubers who talked about those topics were either scraping content from the Farms or from someone else who had scraped content from the Farms.
Personally - I was briefly part of an all-ages Discord server for fans of a wholesome, family-friendly web cartoon involving talking animal characters. A furry appeared (this was not a furry server) and immediately started up with furfaggotry. After cross-referencing his name on the Farms I discovered he was a diaperfur sick fuck and got the admins to ban him. The admins were also artists of the webtoon and the furry was DMming them trying to get them to have his fursona included in the webtoon, and at least one of them was so much of a pussy that they probably would have ended up doing it if not for the info I found. Thanks for keeping children safe from pedofurs, Kiwi Farms!