BTC and ETH are the interesting and worth putting a small percentage of your holdings into (BTC [0] as an international store of value that has benefits over gold, ETH as the core programmable token that backs anything that stores stuff on chain to manage decentralized state). Vitalik is earnest and his writing is pretty great. Everything else I'd probably avoid (except to play with). ZCash's privacy protections are pretty cool. Outside of that risk is extremely high. Lots of bad actors, but also a pretty cool new technology with a new capability for self-custody. If someone tells you you can make 20% risk free returns, they're lying to you.
I feel bad for people that lose everything making dumb bets. It's why all the institutional investor rules exist. It's why there are restrictions on trading with leverage. Still, it's annoying that I'm prevented from making bets (or investing in startups) because of people like this. I understand the purpose of the regulations and clearly there's a need, but it's still annoying.
[0]: https://www.matthuang.com/bitcoin_for_the_open_minded_skepti...
[1]: https://vitalik.ca/
Somewhat related this article was pretty interesting: https://www.lynalden.com/what-is-money/