Maybe 'Tragedy of the Commons'? [0]

[0] https://en.wikipedia.org/wiki/Tragedy_of_the_commons

Tragedy of the Commons, as mentioned by others, sounds most adequate. In general this is one of the whole class of coordination problems - where actors reach globally suboptimal outcomes by failing to coordinate with one another.

Tragedy of the Commons seems to imply some harm is happening to the actors themselves; the coordination problem with computing resources here is a little different, because most of the time, application vendors don't feel any impact of the problem they contribute to, which makes them even less incentivized to coordinate.

It's not exactly what you're looking for, but I've always been fond of Raymond Chen's "What if two programs did this?" thought experiment:

https://blogs.msdn.microsoft.com/oldnewthing/20050607-00/?p=...

Parkinson's Law

"Originally, Parkinson's law is the adage that "work expands so as to fill the time available for its completion", and the title of a book which made it well-known. However, in current understanding, Parkinson's law is a reference to the self-satisfying uncontrolled growth of the bureaucratic apparatus in an organization."

Hmm, I can see how they're related, but it doesn't seem to be quite what I'm talking about. I'm more referring to the overuse of resources by individual elements assuming or acting as if they're the only thing using it, like in the above examples of a teacher acting like their class is your only one, or a thread consuming resources like no others are active.

Parkinson's law more seems to be the result of the effect that I'm talking about (among others, like procrastination).

Tragedy of the commons?

willful ignorance?

"to throw money at it" is a general expression for the solution to overcommitment, schedule conflicts and resource exhaustion.

I'd call it Assumption of Isolation.