It wasn't a trading platform, and certainly wasn't doing the transactions on a blockchain. It was "lending" platform, where you deposited your crypto and earned

It wasn't a trading platform, and certainly wasn't doing the transactions on a blockchain. It was "lending" platform, where you deposited your crypto and earned interst. Apparently they loaned out your crypto to low risk individuals/companies etc. But turns out it was an outright scam. By the way, there are legit decentralised blockchain based lending platforms like Aave.