Bluetooth-capable KVM switch?

Searching the net I have noticed that the request for a smart BT KVM switch (keyboard/mouse/trackpad pairs with switch, not with computer, so you can control multiple computers with one wireless keyboard/mouse/touch setup) has been around for at least five years. I can of course re-ask that question, but I probably get the same negative answer.

That makes me wonder, how come nobody has been able to get such a device to the market?