roulette is easy to cheat. There is a way to win your initial bet "x" everytime, as long as you have quite a few multiples of x.
Bet x on red or black, it doesn't matter.
if you win. great, if you lose bet 2x on the same colour.
if you win, you've lost 1x, initially. you've bet 2x, received 4x, and so are 1x up.
if you lose, bet 4x on the same colour... and repeat till you win.
when you win change colour.
That's not a cheat. It doesn't always win. The odds are in the casinos favour. Lots of people with limited mental reasoning ability try that and lots of people lose lots of money.
If you get a string of losses then how much money are you prepared to stake? Let's say you start off with £500 and you lose the first bet.
£1000, £2000, £4000, £8000, £16000, £32,000, £64,000, £128,000, £256,000, £512,000, £1,024,000. Got that kind of money in the bank? You know that casinos have a limit on the size of a single bet?
The odds are in the favour of the casino. The reason why is the 0 (and sometimes 00) on the wheel.
Every time someone places a bet on roulette the house makes 1/33 of the bet. It does average out over time, it doesn't matter about individual wins or losses unless you can predict the outcome. Claiming you can predict the outcome by saying it'll eventually go red is nonsense.