Companies have always written their own software (or abused spreadsheets). The tool is the computer; writing software to solve your own problems is advanced to

Companies have always written their own software (or abused spreadsheets). The tool is the computer; writing software to solve your own problems is advanced tool use, not making your own tools. Obviously this doesn't apply to every kind of software, but I would argue that anything someone might be tempted to build in Excel is fair game.