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It's common among Rust projects (the standard library also uses it).

Apache 2 has a patent grant so it's preferred by companies, but is not compatible with GPLv2, and MIT is compatible with GPLv2.

For completeness:

Apache 2 is compatible with GPL 3, which outside the kernel most of the world uses.

> which outside the kernel most of the world uses.

I'm... Not sure that is the case?

Some big projects still on (L)GPLv2, off the top of my head:

MySQL & MariaDB, QEMU, Busybox, Git, Wireshark, probably many many more.