The majority of phones sold are "Linux phones" -- it's the kernel for Android!
The top selling laptops for years provide "Linux on the desktop" -- Chromebooks run ChromeOS, which is Linux!
Nearly all host servers, at nearly every cloud provider, run Linux. The vast majority of cloud VMs run Linux.
The vast majority of set-top boxes, IP cameras, IoT controllers, and other embedded devices are Linux based.
Linux is even powering an autonomous helicopter on MARS, that has been wildly successful in its mission.
The narrative of "poor underrated Linux gets no love" was plausible until maybe around the mid-2000s. But it's long past time to drop this idea as a community.
Now, I think it IS fair to say that several forms of userspace ecosystems, based on the Linux kernel, have failed to get traction over the years. Maybe we can say "Ubuntu Touch" failed to get adoption, but that has little to do with some characteristic of Linux itself.