Sure. Without open-source projects, I would not have been able to build Radar. So, I wanted to give something back for the incredible work open-source maintainers are doing out there. Hence, the statement.

You will find it on the pricing page when Radar comes out of beta. The only thing I'm confused about is what kind of criteria I have to set before giving a free license to the person who wants to claim the offer? I'd appreciate it much if any of you guys can help set the criteria.