The main problem is not that exchanges place bad coins on their platforms, but that such coins generally enter the market.
Indeed, without proper funding, the project will not have money even to pay for listing on a bad exchange.
So the culprits of this whole situation are investors who for one reason or another give their money to projects that are subsequently useless for the market.
As a rule, the reason for investing in such projects is financial interest. Look at the list of top coins.
A huge number of mediocre projects received their funding from us. The problem is not in bad projects, but in people who invest in them.
Good point the problem is how investors choose projects and how they deal with their interest, shitcoins still exists since investors still playing with their fate. Gambling with uncertain project and try their luck if the coin that being listed will work for them and bring them benefits. No assurance but they're willing to take the gamble.
And some bounty hunters is also at fault here.
In the past year, a lot if investors are avoiding some projects since there are a lot of bounty hunters that ruin the projects. As they received the percentage they wanted, they immediately list them in market to sell with lower peice. More will follow and the price is getting lower and lower. There are a lot of coins that is not shit to start with.