If you get a return of 4% per day, will there also be a disadvantage? Nothing in the world is for free. There are always risks involved.
Sure that there is a big disadvantage.
You might not receive that promised daily return as most of those offers are likely to be a scam. But the same as the banks which I usually check their interest rates, others are finding it that it's like a daily or monthly percentage of profit.
All clear that it is an annual rate.