I think that bad coins and projects practically steal investment funds from other projects, because a potential investor could invest his money in a more profitable and more promising project, and it has to be assumed that his funds are lost for the entire cryptocurrency market.
They steal from the pocket of the legit projects. The fair market conditions do not exist, unfortunately. The market fairness determinant is irrelevant and accepting this theory can make us understand the idea behind the greediness of crypto trader.
No one is going to remove the crypto currencies,if we don't hold those cryptos they will eventually fade away that is the advantage of decentralization.
I don't think so. The useless altcoins are removed from trading stations with lack of trading by traders. The market decides which altcoin has potential and which ones are shitcoins. It depends on the analyze of general market traders.