I think its not about a coin being erc20 or what but its more on the project itself and the devs. I have also seen a lot of projects that creates hype and good PR until the end of distribution or airdrops and then you wouldn't hear anymore about them. It is annoying but I guess it's easy to pinpoint erc20 tokens because it is easy to create smart contracts in it so most scam and shit coins are made out of it.