Even when they give interest I'll never use them when they keep blocking people when they gamble. Don't like it when they ban people without any legit reason.
Why is that? If that's their business model and if it's in their TOS, how can that be bad?
I am very interested if they are a reliable party, if yes, I will make sure to deposit some coins for testing.
I actually trust Coinbase and have used them in the past. They closed my account, not for gambling but for a stupid mistake I made with a bank account that was closed--it's a long story, but it's more or less my fault.
If they're paying interest, I'd totally go for that. But from what funds are they paying it? Banks lend customers' deposits and make their own interest and can thus pay a smaller amount back. I don't think Coinbase does any of that. Perhaps they're paying out of their profit?