To be fair, there are people who get to know about the existence of this casino not only because they searched it on Google or something. This service used to be so big and reliable that I got recommended to use it when I was in college and some friend told me to register to get some Satoshis from their faucet and perhaps gamble a bit with them, I did not even need to search on the internet I was send there from mouth-to-mouth advertisement, that speaks volumes about the previous reputation this casinos used to have before started to expand their ecosystem with those FUN tokens.
Though, you are still right when people get to know the casino before the sources of information about that casino or reviews about their legitimacy and reliability, only when people get to have a bad experience is when they seek for places on the internet to complain about what happened to them.
I know that Freebitco used to be one of the best names in the crypto space and it has also been very promoted and really full of mouth-to-mouth advertisement, but for the past 1.5 years, they have had problems constantly and I think that freebitco wouldn't be advertised mouth-to-mouth recently. I can't believe that these people have been using Freebitco for the past 1.5 years and they experienced issues recently, that's why I believe that these people were searching free bitcoins on Google, then registered on Freebitco, claimed faucet and deposited a few money, then decided to withdraw and then started searching with keyword Freebitco Scam, then reached to Bitcointalk, created a new account and started complaining here.