Server was won pretty quickly as Linux became the only remaining Unix.

Mobile was won because Google picked it as a kernel, however it’s at best a pyrrhic victory because the userspace has nothing to do with other Linux.

Desktop also needs a specific event to be won, it won’t just grow up progressively for no reason.

To be clear, while Linux has won much of the mobile market - FreeBSD still has roughly a third of the market worldwide, and more than half in the US for an example.