This is true, but nVidia realized it was cutting into their workstation market. Because they were essentially very cheap workstation graphics cards.
You mean server. Tesla were all about computing, workstation Quadro's has always been more for advantaged rendering/modelling. And you could not use quadro drivers on titans(well you could mod them but it did not behave like it should. You could mod your hw with soldering couple of smd resistors and use quadro firmware's).