It's just my impression and it's up to you to decide. For me, it started looking similar to past scams. WITHDRAWAL DELAY!
1. They've imposed a 3-day waiting period for withdrawal without any notice or warning. It eventually became 3-workday. It may become indefinite. You won't find any notice or warning about it on the website, even now. This kind of changes must be notified to users. But they keep it silent untill someone writes a support ticket.
2. Stopped answering support tickets. They may have been receiving too many tickets or just decided to ignore.
PS: E-coin workers don't need to send angry pm to me. Solve your problems and notify your users. Place warning on your website. It's very easy to place a html tag
Notice: 3-day waiting period
if you don't know how to add a html tag
.