Linux maintainers are unwilling to get rust into the kernel, so some rust folks decided to start writing a new kernel with same ABI. This allows them to make new architectural decisions. An example being their “frame kernel” (something between a monolithic kernel and a microkernel).
If I may say, it’s more legible and the tooling is way better, right off the bat.
You could create an issue to address it. I’m not sure why they consider MPL to be a good license for the project. Of course somebody could contact the linux rust contributors and suggest they create another project with GPLv3 or even AGPL.
Anti Commercial-AI license
The website praises it as a superior license that they chose specifically because of the weak copyleft, I doubt I could change their mind