Bots don't deserve 'grace'. Stop anthropomorphizing soulless token prediction machines.
The Matplotlib team are completely in the right to ban AI. The ratio of usefulness to noise makes AI bans the only sane move. Why waste the time they are donating to a project on filtering out low quality slop?
They also lost nothing of value. The 'improvement' doesn't even yield the claimed benefits, while also denying a real human the opportunity to start to contribute to the project.