It is the same scene in most large organisations, which is why no client is named for it. Something was spun up for a deadline. It worked. The person who understood it moved teams, or moved on. The tag was never applied, the wiki page was never written, and the machine kept running because stopping it required someone to be sure.
Multiply that by a few years of deadlines and you have an estate nobody can describe. Ask who owns a given resource and the honest answer is that the question has no addressee. Ask whether it can be switched off and the honest answer is that finding out costs more than the machine does — which is exactly why it is still there.
The arithmetic is worth running with your own numbers, because it is often not close. Take one month of the bill and set it against buying the hardware outright and paying someone for most of a year to look after it. Sometimes it comes out the other way, and then you have something better than a saving: a documented reason to stay, which stops the same argument being reopened every budget cycle.