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.

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.