I doubt freebitcoin got enough advertisement out of this. I mean they were already one of the most known casinos in the whole crypto world and certainly the biggest faucet out there by a large margin, how much new user could they actually get from something like this. Sure they got some but is it enough to justify a 200k giveaway? I doubt so, they probably bet on the fact that people who came in here for this will stay a lot longer when it ends as well, that would help, plus casinos have to keep doing promotions so that they don't lose customers and that is another positive of this as well.
Freebitcoin already gives out so much, having lambo on top of that must have created some financial issues like not earning enough for a long time but at the same time it definitely prolonged websites life for sure.