I'm old enough to remember that PCs got into the office this way...local managers bought them as they were a great way to get around the central IT department's restrictions. IT controlled accounts and software on the VAX and on the IBM big iron, but PCs were standalone.
Sooner or later the PCs became business critical, so IT were stuck with them whether they liked it or not.
Was how I got into IT in the first place - the IT department refused to touch our PCs, so I looked after them. More fun than what I was supposed to be doing and made it easier for me to get a new job once our office got consolidated out of existence.