Usefulness is not an objective, fully abstract property: A thing is not useful for everyone or in general but mostly just for specific people in specific contexts. And useful never comes for free.
But let’s take a step back and use a different example: Child labor. Child labor is very “useful” if you want cheap labor. It’s 100% deplorable to use it or accept it.
It might be a tool, but it is naïve not take all of its externalities into account.
From tante’s piece:
Edit: a good source of said externalities: https://codeberg.org/ethical-foss/open-slopware/src/branch/main/why_not_llms.md