Polarity Exchange doesn't expose deposit addresses and withdrawal addresses to the public internet, but the owner of polarity exchange can choose to link withdrawal addresses to my turtle network wallet address in his personal servers.
xchange.me and fixedfloat.com link an order to deposit address and withdrawal address and expose every order to the public internet.
In my theory, there is no point in creating a new subaddress for each withdrawal from polarity exchange, but it can make sense to create a new subaddress for each withdrawal from xchange.me and fixedfloat.com
What do you think? When should I create a new subaddress? Ideally, I don't want to create too many subaddresses.