I think it's always safe to invest in the cryptocurrency world. It's not safe to keep money in the bank. Banks are like blood-sucking vampires using investors' money. In fact, still solid ICO projects are candidate to offer good products in the future.
Banks aren't investment place but a place to save money. Cryptocurrency is a place of investment and all investment places have their own risks, I just think when you buy bitcoin or altcoin last month and hold it up to now then you will find a big loss. Different if you saved money in the bank last month, until now you will not find a loss.