Because of the IOST mainnet happened on 25th February had become the reason for the growth of this coin. With in one week of span the users database and transactions are doubled and growing as we speak.
The other thing about this rise of IOST is it's transactions volume had passed the ethereum whole network volume with in just a month after the mainnet launch of IOST. These makes the IOST the most underrated coin of 2019.
Original article,
https://medium.com/iost/iost-enters-exponential-growth-wallets-doubled-in-one-week-transactions-exceeded-ethereum-network-44efedb99b73