The continuous price decrease after listing on an exchange with actual working products in real life
The above quoted line defines Shitcoin!
If a coin's price constantly decreases right after listing in exchange even the coin has real-life working products then it is indicating the owners are dumping their coins and panic sell will also lead.
If this is the scenario then I will say they really don't have any working products or they just don't care... What they care only is money and a quick exit IMO.
a stable price and a minimal increase in price but lacking real life working products?
The above quoted line defines Shitcoin!
No working products = no value to the coin. Fake promises will not work for long.
What actually defines a shit coin?
There could be more reasons for shitcoins...
As an example, a coin has a working product and the ico was successful and when listed on exchange the price only dropped, never increased.
The reason could be the product they are offering doesn't have any value in the real world. Now you can say how come ICO was successful? Well, that's hyped out during ICO and naive investors got into it.