Coins should always be considered in a safe storage, there are lot of wallets and platform that could be used to hold coins, both of this has good side and bad. Where will you choose to store or hold your coins, in a close source wallet (exchanges) or an open source wallet like electrum and Hodler wallet?
Usually, I bought coins and joined in a bounty where can I store their tokens in MEW. I do not trust those coins that has their own wallet because it may be a scam. In fact, I never store at any exchange unless if it will be sold for more than a day. There is no such thing as safe storage in cryptocurrency because any digital thing may hack or inflicted by a virus. So, we should know how to protect our tokens and always look for it.