These are volunteers providing hundreds (at a guess) of hours of unpaid labor to a project they're giving away for free. You also expect them to pay an artist out of their own pockets?
Maybe an artist (for example, you) could donate his or her time and provide them with a better logo for free.
Random generated images slapped up in a context where there’s clearly no competing commercial interest just seems like a really silly hill to have this fight on.
Even if you take a hard line on the debate on model training data, this is an utterly harmless case, and certainly not worth the gut punch threads like this cause to someone who is just trying to share their open source project with the community.
Also, you don’t in fact know that the model used to generate this was trained with art used without consent.
This is an internet forum, there's no hill here. It is the lowest possible stakes to have this discussion imaginable.
It is just as easy to grab some CC-licensed images and throw them together in an image editor, like nearly every other FOSS project does at this stage.
Neither is "I'm not going to contribute a damned thing, but nonetheless the team behind this free product needs to spend more time and/or money to make me happy."
If you don't like the logo, well... that sounds a lot like a personal problem to me.
Maybe an artist (for example, you) could donate his or her time and provide them with a better logo for free.