I never said they created it. I said they have made substantial oss contributions.
And does it really matter? If an OSS project is forked, soars to new heights, and sees use in millions of devices all over the world is that a bad thing? Or would you prefer it remain a quiet little sleepy project for 3 devs to bikeshed on.
Webkit was not a simple fork. Apple took KHTML, pretended to upstream patches for an extremely short amount of time, then purposely made it too difficult for the original maintainers to accept patches any longer until they had successfully killed the project. Classic take what you need from other's hard work at all costs.