I have no basis for this other than human insight, but I suspect it didn't happen sooner because Jack didn't want to compete with Ev. It makes sense too if you

I have no basis for this other than human insight, but I suspect it didn't happen sooner because Jack didn't want to compete with Ev. It makes sense too if you believe that the internet is an ecosystem and you want to support complimentary products in yours rather than roll your own.