What happened?
Allegedly of course.
Jony Ive basically works for Open AI (it's more complicated, but it's a good approximation), and has more or less rebuilt a designing team over there.
He's not the central person mentioned in Apple's accusations but that's arguably the central point that's triggering all of this.
He "took" several Apple employees with him when he left and there's been a steady stream of Apple employees going to OpenAI.
Ive isn’t responsible for all of them obviously, but the articles about lawsuits says there are 400 former Apple employees at OpenAI.
Without his support, his protege Alan Dye left for Meta and improved the design skills at both companies.