Volume transaction isn't the only way to judge if the coin is real, there are many fake and useless shitcoins with high volume transaction, you can check in the top 10 coins in CMC or Coingecko, most of them are shitcoins.
Someone can create a new coin and fund it with big amount of money to pump the coin, after many investors are interested to invest in their project, they can abandon the project and run away with investors money.
I don't agree that a coin is real or not real. If it was created, deployed by developers, it is real. The rest is only it is a quality coin or zero-value coin with no use case, no utility and no one minds to own it.
Trading volume reflects demand in the community and if no trading volume, it means nobody has demand on that coin. Hence, no demand, no price, no value and it will be die even developers don't want to abandon that project. In reality, developers usually abandon their own projects before those projects die. They proactively left their projects when they see no future ahead or they smell that a trend for their projects already gone.
This is why it would be always important that you should really know on what are the things that needs to check on which i would really be always liking to spot or check their WP and their roadmap.
Of course you wont really be just that easily on reading it up if ever its available but also you should really be needing to assess whether its realistic or not because there are really that those kind of utility which it is really that totally unrealistic and something that delusional and this is why you should really be that wise and on assessing whether its worth or not. Dont make yourself that getting hyped
or having that kind of FOMO.
Exchangers would normally be delisting those coins which arent generating liquidity on which means that if ever they cant really be able to benefit because of fees then it would really be that
understandable that they would really removing into those projects/coins and would be freeing it up on something new. Exchangers are businesses on which it would
really be just that normal that they would really be giving priority into those projects or coins that could give huge liquidity which we know that this is
where they do make money, so its just a normal act to be done by them.