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I think only decentralized games/house games show real fairness on the game while the rest is more on trust basis games when it comes to fairness. The advantage of online casino when it comes to fairness is the high RTP they offer since they have lest operating cost so they can increase their RTP.
Now, Online Casinos have developed quite rapidly with increasingly advanced technology.
Blockchain technology also makes the transparency of Online casinos increasing, ease of use, ease of making deposits and withdrawals using many currencies including cryptocurrencies.
About fairness in online gambling is still a complex issue involving many factors.
Now it is only necessary to choose which casinos have a good reputation and also their software that has already done an audit.
There must be transparency about the game mechanics and applicable rules, it is very necessary so that players can trust and more and more users enter safely.
And for a high RTP will also not be fair, so some of the factors that have been explained will be guidelines for choosing fair online gambling.