Don’t sign a CLA
The point is somewhat ruined by getting major facts about licensing and Redis wrong:1. It was about proprietary addons, not community version at all.
2. The license of Redis would allow such relicensing of externally contributed code without CLA. Read the damn BSD license, that permissiveness is its whole point.20 years ago, OSS developers understood their licenses. These days, it seems common that people slam a random license on their code or contribute somewhere with absolutely no functional understanding of the legal aspects.