Well, that is a very good point, lets add that up as one of the reasons.
We had a discussion here regarding this issue couple of months ago and I was suggesting them that maybe these emails have been used in different website discussions about cryptocurrency, but there were who claimed that they didnt used their emails from any other website except the exchange. So, what we are suspecting was, the involvement of the exchanges in such issue. Idk really, but that was just the closest theory that we ever come up with. I could be wrong, least we can do here is to regularly check our accounts and emails to prevent from being robbed.
You can use free service such as haveibeenpwned.com to notify you if a website containing your data were hacked.
I doubt exchange would sell their customers data, the risk when being found out is too high. It's more believable if an exchange got hacked and its data leaked to internet.
Case of Bitcoin exchange being hacked are not new here, There's always at least one exchange hacked in a year.
Thanks for the extra tip. I doubt that as well, but there are those who insistand that made me on the verge of believing it, but that would be too risky with the exchange's integrity.
Hackers who can succesfully access the customers essential info can also be bad to the exchanger's image.
Neverthless, these are just one of the risks in investing to cryptocurrency and it would be better if we help each other to prevent this from happening to our fellow investors.