react-native (Facebook) and some of the other big projects (Alibaba, Google, Palantir etc) have Contributor License Agreements (CLIs) that you need to sign in order for them to accept your contribution.
It's a painless process, but you do need to provide them with some info ranging from just your name to your address and phone number.
Yikes. Imagine thinking that reading, understanding and signing a binding legal contract is a reasonable prerequisite to submit a patch to a software project. I suppose I might be willing to do that if the maintainer was going to foot the bill for my attorney to review the agreement...