Be aware that if you license your work under the BSD then someone else can take your work, change it, improve it, sell it — and never share his changes with you

Be aware that if you license your work under the BSD then someone else can take your work, change it, improve it, sell it — and never share his changes with you. So Netflix could take your recommender system, use it to make millions and do nothing but mention you in a footnote somewhere on their website.