The exchange does not support segwit format yet, we may add it in the future so users can pay less network fees.
Any particular reason why you don't want to implement it now? If you are going to be successful in the industry, so many of your customers are going to request you support segwit addresses for deposit.
Concerning the addresses we use those of the exchanges so yes the addresses may have already been used.
It's like most cryptocurrency exchanges available on the market.
I know you have not advertised your service as a privacy one, but i believe it is still important that you provide a unique and one-time input address for deposit, so you get to attract customers that care about their privacy.
We take note of this ✍🏻.
Yes, it is for a particular reason.
For the moment, the SegWit addresses and the legacy addresses must remain separate.