Hublot has been around for a very long time before the Biver era began and the Big Bang was first released. The Big Bang is a hyped up sporty version of the original "porthole" design that has been around for decades.
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Yes there is a similarity to the RO, but I think to say they are somehow ripping off the RO as you are implying is going too far. The only thing they really have in common with the RO is the screws on the bezel.
There are many different types of watch collectors out there, and as you indicate Hublot uses innovative designs and materials, so will appeal to the "new tech" type of collector who wants to see watchmaking technology advance in this. This is in contrast to the more traditional collector that values old style craftsmanship. Not saying either is right or wrong, just a different focus.
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