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.
Don't act like a red alarm, be quiet just like regular user. Personally I have never had problem with skrill:
https://www.skrill.com/transfer-money/skrill-cryptocurrency/Can't say anything about neteller because I have never used them but have done some btc/paypal exchanges regularly and never had any problem. You have to find someone whom you'll trust in such situation and believe that that person won't use chargeback option and will be fair with you. That's why it's usually hard for newbies to exchange their paypal funds in bitcoin.