Nope.
Nope.
I mean in this case I'd say the copyright is transferred to a nameless entity, e.g. "the Yue project". IIRC any project with a developer agreement (like Google's) include a transferrence of copyright note.
Yes. Pretty much all the most successful FOSS projects operate like this by default—there's no central authority and contributors retain their copyright. It's only in the last couple years or so that a weirdly high amount of orgs even started cargo culting the CLA process. And the reason for the CLAs seems to be that this was happening for nascent, quasi-corporate projects from orgs who were making their foray into open source and were under the impression that this is just how everyone else was already doing things. Meanwhile, back in reality, the old standards and posterchildren for open source were actually humming along with no CLA in sight. (E.g., Linux, Mozilla.)
The CLA trend is waning, though, as people realize that they were never necessary, they only really only introduce friction to contribution process, and the only reason anyone ever adopted them was because they were looking around and trying to emulate each other. (You know the phenomenon where someone seems to be famous just for being famous?) Projects that came about during this time (e.g. NodeJS) have actually been getting rid of their CLAs.
EDIT:
> IIRC any project with a developer agreement (like Google's) include a transferrence of copyright note.
This is not true wrt Google. Contributors retain their copyright. Where did you learn otherwise? Comments like this are how famous-for-being-famous happens.
A CLA is still necessary in some form in this case for the owner of the repo to re-license the product under the commercial dual licensing scheme.
And of course there are tons of Open-Source projects that don't have CLAs at all.
As stated else where it seems like author has copied/forked existing project. Then (if I understood the license correctly) you are required to open source your software if you were to use the library, or pay $5k. On top of that if you contribute to the project you sign away your copyright.
If these things are correct it seems like a one hot mess of a project.