most of the reasons why these coins can be called shitcoins are because they are worthless, only listed on small exchanges, or even failed to be listed on any exchange, so they can't be sold and are worthless
This is a good point but generally correct. But that is the BSC in general. I wouldn't even know where to start to count all the coins.
But the other side of things, is a token/coin has to start somewhere, unusually on a small exchange, but it can grow. BANANO for example (hard fork from Nano) has been around for 3 years now and is still not on the "big" exchanges. $BYG is also another example. Black Eye Galaxy is a decentralized NFT token. It is currently not on any large exchanges but as the new NFT platform/game takes off it hopefully will be added to others. I am excited for this and hopefully score some nice planets and have some big returns.