I imagine if this ever comes to bite projects in a big way, they'll move to the legal agreement of the type you suggest, and/or cease accepting contributions fr

I imagine if this ever comes to bite projects in a big way, they'll move to the legal agreement of the type you suggest, and/or cease accepting contributions from the relevant jurisdictions. That being said, LLVM is not asking for a copyright contribution here. They are asking the contributors to sign an agreement, the meat of which is, "The Contributor authorizes LLVM to include the Contributions in the LLVM project, and the Contributor hereby licenses the Contributions under the terms of the Apache Software License, version 2.0, with the LLVM exception." That's not a copyright assignment. Other groups also do not ask for a copyright assignment. Here's from Google's CLA: "Subject to the terms and conditions of this Agreement, You hereby grant to Google and to recipients of software distributed by Google a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your Contributions and such derivative works." In this agreement, you still own the copyright, but you've given Google a perpetual, worldwide, royalty free and sublicensable license, which means that Google could basically reexport your contributions under whatever license they want. Facebook/Meta's CLA is almost identical. They aren't excluding any countries from contributing, so presumably this type of language is sufficiently enforceable everywhere.