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Without a doubt it is possible for this to happen, however if we are talking about a regulated casino which engaged in such an illegal practice, you can be sure the fine they will have to pay will be many times higher and they will lose all their reputation with that single scandal, so many casinos prefer to not take that route as whatever additional profits they may get this way are nothing compared to the money they will lose once such decision becomes known.
Actually there's no sense on doing such thing about having no awareness about on the games that they are offering or available into their platform.Its really that too impossible that they can't be able to notice that they are earning too fast on a specific slots on which it would bring out such attention.If they are really running some serious business on here then they would really be doing their best on taking care of their reputation because we know that building up casino business is never been cheap and never be simple.
When it comes to players perspective then to those gamblers who do have that long time experience about slot games or simply they could notice out that there's something odd on the game specially on winning up the game then expect that there's someone who would be able to notice.We do know that in any business on which if trust becomes an issue then it is really that hard to recover or regaining back the trust or simply it would tarnish out forever.Good thing that they had compensated to those users had been affected on which it's an ethical thing to be done but well they would do it of course because things had become that messy already.