Ok this is pretty basic question but surprisingly I tried googling it but didn't find the answer. So like always I turn back to my people for this answer. Why companies like binance choose certain cryptocurrencies for future trading and why they don't provide all cryptocurrencies for future trading.
Binance and the rest of the popular trading sites will choose those coins that have good liquidity to support with. Not a new thing to see and this become the basis of many traders. Perhaps, traders will look at those who have a huge trading volume and it becomes usual that not all cryptocurrencies show that which makes these trading exchanges step in and give help traders to choose preferable coins for future trading.