I think the whole industry is bent as a 9-bob note mate. Who knows whether these games are paying out the percentages they are supposed to? I'll bet (bad choice of words) half of them are not.
They are all regulated they run off a random number generator system and you can find the information for each slot on every bookies site before playing. Anyone governed by the GC cannot tamper with any of that stuff and the games providers such as red tiger would not risk losing their license over it.