Yes, the content you create using Runway is yours to use without any non-commercial restrictions from us. As between you and Runway, you retain ownership and all your rights for your creations and generations. While we always love getting shouted out, you are not required to credit Runway anywhere you upload Runway-made content (such as YouTube, on social media, or to film festivals).
For more specific questions on commercial use, please check out our terms of use here.