The KVM just uses a devboard that's also sold separately and just happens to have a microphone, given how cheap the mics are having one extra SKU would probably just cost them more than savings.
Also I wouldn't really consider it "server room" product. Pretty much any new server has KVM, this is more "a hobbyist needing KVM for their home server"
I can't recall seeing any server that includes KVM-over-IP, but instead they have some shitty remote access controller (e.g. Dell iDRAC) that is buggy as hell and requires a subscription to even get working.
Also I wouldn't really consider it "server room" product. Pretty much any new server has KVM, this is more "a hobbyist needing KVM for their home server"