If you bought a new car from Lexus, Lexus probably provided your information to third party research companies. Just be smart, you don't have to fill out everything they ask. If they wanted like Social Security Number or sensitive info, then toss it in the trash.
I filled out a survey when I bought my Lexus last year. Then a follow up survey came in, and ignored it. The survey took way too long and I don't get jack for filling it out. Before I used to get 10 bucks after filling out survey when I bought my previous cars.