You need to know that Cardano disappeared from public this spring after the ICO in Japan. I don't know anything about it after that, I know people lost tons of money.
I think it is a scam in it's second phase
This is an outright lie. Everyone who bought ada vouchers went through vending. The process was transparent and done in public adavoucher.com. All buyers information is here on CardanoHub.org.
Where do you think the ada being traded on bittrex came from? The people who bought it during the sale. The article you cited is slander. There is absolutely no factual basis.