I am confused by the fact that the ADAB-exchange will trade only the main crypto-currencies. Perhaps by Shariah norms this is the right decision. But in order to attract as many people as possible, including non-Muslims, the exchange must trade various types of cryptocurrencies.
I fully agree with you, the more trading pairs on the exchange itself, the better.
Only those coins that meet the standards of Islam will be added to the stock exchange. This is an important aspect.