Like virtualized NICs pretending to be an NE2000? That's interesting, do you know why they'd use a G200 and not something like an older ATI chip?
The ATi Rage 128 was used in everything short of toasters for a long time too. I assume that the drivers are part of what made it obsolete.
Probably started out as a real G200 chip which might’ve been the cheapest and easiest to integrate in the 2000s? Or it had the needed I/O features to support KVM (since this would’ve involved reading the framebuffer from the BMC side), or matrox was amenable to adding that.
Drivers, probably.
They were probably forced to update when they dropped older busses. Without a PCI or AGP bus on there they have to find something that can hang off of a PCIe lane.