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.
Of course they'll choose what's the best that has a good trading volume. It's all about where they can get better commissions than putting all of them but majority of the picks aren't going to have them good trading volume. They're a business and they will prioritize which is going to have the best volume and interest of the traders in their platform. I guess they'll keep on monitoring it which is going to be demanded by their users.