Some scammers have grown and have evolved. They now have a non-plagiarized whitepaper, an attractive website, convincing usecases. Infact, they can look so real with high scores on review sites, they can get a popular crypto youtuber to shill their project. They pay professionals to do the convincing part just to get fund.

They will even have real team members with legit physical office address. They have evolved hence you can't be 100% sure. You can do your best by checking all necessary loopholes and hope they succeed. Crypto space is a gamble