My understanding is that the GUI designers from Xerox also went to work for Apple specifically to bring their concepts to life because Xerox wasn't interested... if the original devs willfully jumped ship to Apple, and were the ones who actually did the work, then did Apple really steal it?

Along the same lines...

Apple was founded because HP didn't want Woz's ideas for what became the Apple I.

Fortunately, Jobs thought he could sell it.