Even is the technology IS reliable, how can we know that the slot we are playing is not a fraud?
Find a gambling platform which has a good credentials, reliability and trustworthiness and of course you can know this by conducting research and information about the gambling platform you would like to get it, but for me it is better to stick with the known and secured and gained already a good reputation into their users to make sure you don't need to worry about, and if you have time try to seek the different gambling casino that is suitable to your needs like boosting of odds, good RTP and etc.
Sadly but this is really the only option for us to make sure that we are playing on fair software since all of the slot provider is not open source and we can’t know exactly how there probably fair system really works because only license provider knew what’s the exact algorithm for there software. The only thing we can rely about is that license provider is doing there job for auditing this slots software that will give fair result to all participants.