Many cryptocurrencies are available in the market for scamming users. They often run multiple presale events and, once they receive investments, they disappear with people's money. Then, they start a new project under a different name to scam again. These actions are unfair to crypto users.
I was surprised to see the data that OP made, I didn't expect it to be that much before I thought the scam project was not so booming.
Seeing this @Rehan Zakir it's sad that something like this happened, I think this is a very extraordinary level of marketing but there are parties who are disadvantaged as you said, still better those who enliven it in a free way, such as participating in airdrops and the like, but the worst thing is that they invest and get stuck and can't even be resold and even die like OP posts reported.
To be honest, I have participated and even experienced similar things where their coins die and are very detrimental to many parties. But from that experience I learned that most of them are the same people with different names. Therefore now I am more careful in choosing new coins even though they look very potential in a profit, we better stay away from them than regret it later.
For me now, I only follow those who have guaranteed quality.