Cryptocurrency exchanges shouldn't sell your personal data. I want to say that they CAN'T but there is always a risk. So, I recommend you to use only popular and reliable exchanges like Kraken,
CoinDeal or KuCoin. It's good to feel safe, I don't even want to imagine that the exchange can sell my personal data! That's just ridiculous!
only reputable exchanges that will keep their customer personal data.kraken , kucoin , binance be one from many exchanges in crypto market that able to keep this data.we have to use exchanges carefully or we will loss our money when their exchanges hacked.as we know in few months ago many exchanges hacked and millions dollars stolen.its possible that our data will stolen too.