So you cannot make money consistently playing roulette, but you can make money occasionally when you defy the odds and have a lucky day. That is called variance,  and it is what makes casino gambling fun and exciting provided you play within the limits of your budget.

In European Roulette, the RTP is 97.3% no matter what you bet. This means that for every 100 you stake, you can expect to get 97.3. Of course, in the short term, you can win anything from roulette because luck plays its part.