Based on my knowledge, the project you are judging is not a scam. Initially, two competing companies won a lot of market share, in the process of competition, one managed to grab a lot of market share and the other failed to reach the target market. so from that case it can be seen why the fraud token you mean fraud is given permission should not.
you are right, but what the OP said is also true, all projects that duplicate the original project often confuse beginners and think the project is original. As knowledge goes we will know where to find information that can be referred to as a guide.
For example, Token A duplicates the Token B project. While the implemented project is listed on several exchanges, you can refer to it at CMC by looking at the contact address listed.
So that it is quite easy for beginners to find out which Token is called genuine. Therefore, at this time we can't blame Blockchain with the system being organized quite well but some beginners often forget about it due to the lack of knowledge about the project.