If you don't understand how a house edge works, you probably shouldn't gamble. Red streaks are possible no matter what % you are playing. Doesn't matter if trying to hit 98% win chance or 50% win chance, they all have streaks.

Let's say you are playing a 50% win chance or x2 on dice. That doesn't mean that if you lose 1 bet, the next bet hits. If that's how the games work then there would be no casino offering dice as they'd just go bankrupt. If you play 1 billion bets or 5 billion bets or whatever, then over time you will lose close to 1% of the funds you gambled. You'll have red streaks and you'll have green streaks but overall you will be near the 1% loss. Of course, it is possible to be very unlucky and be closer to 2-10%, it happens.

You cannot call a casino a scam because you lost though. You should educate yourself and try again another day. You're going to experience the same thing on every site that offers dice with a 1% house edge though.