If it is a really good project I think you shouldn't have too many problems to convince a large exchange to list you as they can also see the potential. At least that is how it should be. And bad projects shouldn't be able to afford the fee or get listed anyway.

I know some good project for which the listing for Binance is not available. At the same time, let me recall the BitConnect.

How is this explained?

The assumption "I think you shouldn't have too many problems to convince a large exchange to list you as they can also see the potential. At least that is how it should be. And bad projects shouldn't be able to afford the fee or get listed anyway." is incorrect. I gave an example of possible situations that show the opposite of this assumption.

There are always exceptions to the rule, but in general that is how it is supposed to work. There are a few other factors that play a role though, too.

So will i be able to freely turn my investment back if something goes wrong? It's like an airbag for me, sounds really cool.

Exactly, it is stated in agreement