That service becomes the source for a management report.
That management report contains useful data that the CEO looks at weekly and uses to build his board report.
The original Aussie guy leaves, but leaves the laptop behind because it's not his. He also doesn't document it (because that would get him in trouble for running a server on a laptop).
...Years pass...
The laptop finally dies. The CEO is furious because he can't create his report. He leans on the IT manager. The IT manager has no freaking idea where this report is coming from or who makes it. They lean on the Support team to find out which server produces this report. The Support team drop everything to work out wtf is going on, because this suddenly became their #1 priority.
Eventually, someone finds the decaying husk of the laptop, and works out what's going on. They put together a plan for creating a supported server to do the same thing. It'll take weeks, because they have to provision a server properly through the usual channels. CEO has a rant at the entire IT department for not supporting critical business processes, and not being agile enough to support the business. IT manager takes a beating in the next management reviews. No-one is happy.
[0]usually a rogue spreadsheet rather than server. The worst case I saw was an Excel spreadsheet in a business-critical department running on a user machine with a post-it note on it saying "don't turn this machine off". If the logged-in user name wasn't the same as the temp who had originally built it, the spreadsheet refused to work and the department ground to a halt.