The truth is that we are never going to know exactly what happens, a casino does not need to cheat, it has a decisive advantage over the player already with the house edge, so a well run casino does not need to cheat their players, however there have been cases like that but it is impossible to know how rare that is, however sport betting gives no security either since matches can be fixed as well.
Yeah that's also what I've been saying a few replies back, but people come up with these wild conspiracy theories that all casinos are cheating.
The profit is just built into house edge, like you say, they have literally no reason to cheat players. On slot machines they can make the HE as high as they want.
I also agree that it does happen, but is very rare.
The thing is that everybody will always have their own opinion regarding casinos and there is just no way at all we can know if a casino is really cheating or not anyway since even those who have been saying it have never been able to see them cheat before or have any proof of them cheating.
Moreover, even without cheating, with any game of chance and the odds being in favor of the house edge most of the time, then I do not even see the essence of them needing to cheat.