This is fake, they are only taking about 2% of the transactions, a friend of mine has bought a lot of bitcoins through Ripio, it takes a lot of time to make your purchase, but after a few days they allow you to do so.
Just make a better research, they are selling most of their bitcoins on Argentina-Uruguay-Chile with a fee of 15% over CoinMarketCap rate at the moment of the transaction
I dont know why Ripio has been going down for a lot of money, it had a lot of potential, but nobody knows from where is all that volume coming from.
A lot of people are saying that it is just coming from the money that they have on their own exchange (which is more than 100 million dollars)