From Quantopian website: "You own your algorithms. Your algorithms are kept secret. Ideas are some of the most valuable assets anyone has. We are committed to p

From Quantopian website: "You own your algorithms. Your algorithms are kept secret. Ideas are some of the most valuable assets anyone has. We are committed to protecting your intellectual property and keeping it safe." More importantly, a lot goes into developing an algorithm including clean data, back testing, infrastructure. Quantopian handles all that for you, so you can focus on developing a stellar algorithm. Of course YMMV.