They do have something – Clear Linux [0]. Definitely not too mcuh investment, but they do differentiate by compiling packages for much newer instruction sets compared to other distros.
Actually Intel has small army of Linux driver developers. Last time I counted in git logs there was around 100 of developers who one way or another contributed to Linux graphics stack: kernel drivers, Xorg, Mesa, etc. We can't really know how many people are working behind the scenes.
Yeah of course it was possible for Intel to do more, but they're clearly largest contributor to Linux graphics stack anyway.
[0]: https://clearlinux.org/