This free interest will not last long.
If a coin like bitgrow has no demand, it will be worthless soon and you will only lose money, even if you receive 10% more coins per day.
There is no free money. People in cryptocurrencies usually don't get it.
I do not understand why people everytime when they see a good profit, they have to say that it is a scam. Cobowallet has over 500,000 users (this information come from late 2018).
I am not saying that it is legit, or promote it, I am just here to discuss about that.