GNU/Linux gets used alright, on IoT, servers and VMs, where the desktop is irrelevant.
While Linux community can pat themselves on the back for having Linux kernel as part of ChromeOS and Android, they tend to forget it is hardly exposed to userspace frameworks used by app developers.
Crostini only works in some models, and follows the same approach as WSL, running GNU/Linux in a virtualized Linux kernel, completely unrelated to ChromeOS Linux kernel.
ChromeOS vNext could be based on Fuchsia and still offer Crostini.
While Linux community can pat themselves on the back for having Linux kernel as part of ChromeOS and Android, they tend to forget it is hardly exposed to userspace frameworks used by app developers.