Not only cryptomining:
https://coinmarketcap.com/currencies/zrcoin/If an investor invests in something he don't
fully understand, it's the same thing that playing roulette... not investment but a game.
Better yes just keep the ETH and hold it forever.
Stay away from Mineum & ZrCoin. There are also a lot of ICOs with no clear plan & whitepaper and no future.
Best to do your own research before giving your BTC or ETH to some group of people riding the popularity of ICOs.