The only fear I got from new cryptocurrency is that as soon as they got listed on exchange and dump by hunters it dies right away. I had lots of tokens who ended up in that way and even some of them never got listed, all of my time and effort just become a waste for nothing. There's even a tokens worth of a penny.
One more thing I fear several new cryptocurrencies because they're most likely a scam. They used to be active during the campaign as soon as the campaigns end they literally don't respond to anybody, and yeah I experience that so be wary.
The projects you talk about are just some of the projects that have a bounty program. But projects listed on major exchanges like Binance rarely have bounty. And people prefer to trade these newly listed tokens because of its high volatility.