Depends on your goals, but I would say the default should be AGPLv3 without CLA, funded by donations and maybe sponsorship and other no-strings-attached sources, with the money going into a non-profit foundation, and the trademarks, domains and other assets owned by the foundation, and the copyrights owned by individual contributors.

https://vadosware.io/post/the-future-of-free-and-open-source...