I believe that only those projects that can use their coins in real life can become successful.
Now cryptocurrency market is developing and cryptocurrencies becomes more stable. Even now cryptocurrency is not so good for speculation like it was in 2017. I think that in future in will be less speculations and more real usage of cryptocurrency.
If there is money in this market segment, then there will be scammers too, it happens everywhere. But you dont need to be afraid of this, you just need to carefully choose projects.