Talk about warnings, caveats, truisms, and transparency. 5Dimes posted this on the Help section for Roulette.
"Roulette is a game of chance. The outcome of a spin is not determined by prior spins. Each spin is an independent event of chance. For example, after seven successive blacks, the chance of getting a red on the next spin is still as likely as getting a black. You should not base you strategy on the false assumption that a particular outcome is 'due' to happen. Some people believe you can always break even at roulette by always betting even money, then doubling down after every loss and return to the lowest bet after a win. This is called the Martingale system. However, in practice this is not possible because every roulette table has a maximum imposed on the bet size.
After a couple of sequential losses it is no longer possible to double down, and you will lose. In fact never believe anyone who claims having invented a winning roulette system. As with all games of chance, whether you win or lose doesn't depend on the system you're using, but on luck and common sense. The outcome of a spin is not determined by prior spins. Good Luck!"
Is this reverse psychology or begging you not to play because the odds are stacked against you, or some other motive? Clearly, there are no laws requiring an online casino in Costa Rica to post any such warnings.