For the fun aspect of this question, I would say Yes,  if Elon musk opens a Bitcoin casino, it is likely to become bigger than any other casino currently in operation.
This is because Elon musk has a very huge community following him already, he has the funds to heavily market the casino, so based on how large his followers are, Elon musk casino will not only attract the biggest gamblers in the industry, it is also going to attract a large community of newbie gamblers too, knowing fully well that Elon musk has the money to pay whatever amount any gambler wins.