The short answer is no, you can't easily identify a coin with a few things. I wanna suggest reading the related forum threads to find out how to filter useless altcoins and avoid investing in such coins without future potential. That mentioned exchange is also not a good choice, so better try popular crypto exchanges if you hunt for gem altcoins, IMO.
Because our first impression is seeing them is not a scam due to their promising offers and rewards, But the reality is that the majority of them are worthless and made to scam innocent individuals. Meme coins recently got their popularity due to the hyped that they have made but the question is how long they could resist and keep the momentum because most of the time it has just stayed a short time and then a decline started to kick in.
Generally, you're right, it was not a good coin to invest long-term but it possibly works in the short-term.
And those promises should be in fact the very first sign there is something wrong with a project, when Satoshi released bitcoin he never made any promise about bitcoin becoming an amazing investment down the line, in fact he was very candid about the real possibility that any money invested in bitcoin could be lost.
And yet the developers of a project which is obviously many times inferior to bitcoin dare to claim their project will produce profits? That is not happening, and anyone with some common sense will be able to tell immediately that such a coin is a scam.