You seem to be arguing permissive licenses should never be used

I didn’t. Though I do think there’s a reason why Linux is actively developing by corporations and FreeBSD while being used by corps is not.

A project meant to just learn about XYZ

That’s not what the project is now though, it’s a project that in effect relicenses core system components under the pretence of using safer language.

It is not a major issue

Obviously not for you but given how license concerns turn up each time, it is for many people.

That doesn’t answer the question why use different license than the original. And why not change the license/fork to gpl when it became more than a fun project. As we see it is a major issue with the project.

So why did they choose to use permissive license instead of the license of the original?