Someone on that page commented:
“It was always open source. They just bought the company who created* and maintained, it, moved the devs over to their own fork and closed down the original, graciously allowing the wine team to maintain their own fork of the old code, as if they needed a permission, lol. It’s a good PR move (also for Wine, mind you) but nothing else.”
But aPpLe CaRe AbOuT pRiVaCy