When small companies get big, there must sometimes be legacy compute jobs still left on the original infrastructure right? Ie. Jeff's original php script to t

When small companies get big, there must sometimes be legacy compute jobs still left on the original infrastructure right? Ie. Jeff's original php script to trigger some automation that never got adopted by any team. Do all the big tech companies still have a box somewhere full of legacy stuff that 'probably isn't important, but not worth turning off just incase it is'?