There has been much talk about the fact that there has been a practice of fixing of online slot machines since the time it became prevalent. In the initial days, rigging the machine to favor a particular party was quite common as there were no such stringent laws against it. Since the time fully electronic slot machines have been discovered, it has become very difficult to manipulate it.
The slot machines online do not follow the practice of rigging but instead there is a random number generator and the amount of money that the gambler will win totally depends on his luck. It is tough these days to rig a particular machine because manufacturers of slot machines have to follow stringent laws as well as provide detail about the number generator and the parameter by which they show wins and loss.
Scams in this industry have been very common and there have been reported instances where casinos have been found guilty of rigging in the past. That is the reason why even online slots provide certificate of fairness from trustworthy third parties so that people getting involved in it are assured of the fact that the game will not be biased.
As far as scams and rigging of machines are concerned it all depends on you and the fact that you only play on authorized online casino sites and check whether they provide fairness certificate. You can also look into the history of these sites and whether they have been doing fair business in the past.
It is advisable to ask people around you about the best slots online so that you reduce your chances to be trapped in a scam. You can play for free before investing money so that you get a fair deal of idea as to how to move ahead. So, if you have been trapped in the scam it is all because you have not found out proper background information about it.