It is prohibited to use these services in their ToS, and so how can I avoid being found selling btc with them? I know about chargebacks and so, but I am interested about how people get banned(and how to escape it) in these platforms, though in case someone makes chargeback against you, administration can learn that you sell btc. Maybe you have a story to tell?

Only things I can think of is telling your buyer not to send additional message with transfer and do as few trades as you can on account, but I need your advice.