I agree with your concerns. This seems to be standard for Facebook. I saw a similar grant for React js project [1]. The wording has had me look at alternatives

I agree with your concerns. This seems to be standard for Facebook. I saw a similar grant for React js project [1]. The wording has had me look at alternatives for commercial use. The patent grant in React has been on HN several times in the past [2] Facebook has an Open Source License FAQ where the explicitly do NOT mention the scenario you mention. [3] [1] https://github.com/facebook/react/blob/master/PATENTS https://github.com/facebook/react/blob/master/PATENTS [2] https://news.ycombinator.com/item?id=12108158 https://news.ycombinator.com/item?id=12108158 [3] https://code.facebook.com/pages/850928938376556 https://code.facebook.com/pages/850928938376556