Every time a cryptocurrency exchange uses a private key for one of its wallets to accommodate a customer withdrawal, there's a risk it could be ...
source https://www.google.com/url?rct=j&sa=t&url=https://weisscryptocurrencyratings.com/news/warning-some-crypto-exchanges-could-be-ponzi-schemes-in-disguise-1875&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNGi1ZA397XBvMjULWSlpenD1wtuCg
