Most people believe roulette cannot be beaten, when in fact it has been beaten for many years with methods the casinos call "advantage play". Such methods revolve around using physics. However, most roulette strategies these days you find for sale are based on what is known as RNG roulette. RNG stands for random number generator, and essentially it is not roulette - it is a slot machine with roulette computer animations. A genuine winner roulette system cannot beat RNG roulette, and a genuine seller of a strategy that wins would clearly state this despite it being an unpopular comment. Despite the misunderstanding of what rng roulette actually is, when a system seller claims to have a roulette system that beats RNG roulette, what they are in fact claiming is that they can beat slot machines. Furthermore, they are unwittingly claiming to know how to predict random game outcomes from the RNG computer's chipset, which is simply not possible without having the actual machine in ones possession. So the number one way to spot a roulette system scam is to understand if the seller claims to beat RNG roulette, you can be certain they are lying.
For any strategy to be effective in the casino, the player must first have increased the accuracy of their predictions with respect to game outcomes. In the case of roulette, it is knowing where the ball will land. While of course knowing the exact location of the winning number on every spins is just about impossible, it is by no means impossible or difficult to at least know the approximate location of the winning number, if you have calculated the ball's deceleration, the rotor's deceleration, and how far the ball typically bounces once it falls. The bounce element is known in the gaming industry as scatter, and it is is predictable to a certain degree - certainly enough to overcome the house edge. My point of this is valid methods rely on particular sectors and segments of the roulette wheel. But most roulette betting strategies are based on outside bets, such as reds, blacks, odds, evens and so forth. But such outside bets represent a scattered or jumbled group of numbers, which is the opposite to consecutive segments on the wheel. Hence outside bets are guaranteed to fail, despite almost every roulette system being based on outside bets. So you can be sure that if a system relies in any way to make outside bets, it is guaranteed to fail. The casinos know this very well, which is typically why outside betting limits are much higher than inside bet limits.