It is like investing in a penny stocks and it is a good thing to do as well.
Eh, sort of, I guess. Penny stocks are mostly scams with no real business behind them. These shitcoins have even less tying them to real-world things, and both of them are super, super-risky. I suppose if you only spent a few dollars on each, it'd be like playing the lottery or something, but do some of the shittier ones even have wallets? I agree about not keeping anything on an exchange. That's a recipe for a "I got hacked!!" scenario.
Me, I wouldn't buy any of them except to trade in and out really quickly with. I wouldn't hold any of them for even a month, including the ones on OP's list.