You can't blame people on this. Because there are so many cases of scam now a days. They're just protecting their assets and privacy. Scammers now are genius, they use to know even your personal information. So be careful on using your account and assets for investing and other transactions.
Yes there are many scammers that ride the popularity of bitcoin and any altcoin, but no one can be a victim of a scam if you don't let them. Just remember that there is no easy money in the world today, everything is need to work hard and spend time prior gaining income, therefore if someone asking you money in exchange of a big money after then think it twice because ponzi is everywhere in this digital world.