I think most people approach crypto in the wrong way. With "get rich quick" approach.
If you come to crypto with such an attitude, you should never ever invest.
On the other hand, if you actually had to earn it while doing whatever you are usually doing anyway, that involves money?
Examples:
You get crypto as a token of gratitude after making donation to some project. (crowdfunding)
or
You are paid crypto as a bonus to your salary.
or
... (any other examples come to your mind?)
Wouldn't the whole cryptoworld be way more healthy? What do you think about it?
I do understand your point but the title of your topic is highly misleading by using the word 'never invest' instead of saying 'never have this kind of attitude, etc.'
Cryptocurrencies, just like any other investment mechanism available, is an investment that deals primarily with the influx of the prices of it. Due to being decentralized in nature, its price is highly volatile compared to gold and stocks. Others got lucky when the price of bitcoin skyrocketed last year but others also felt loss when they invested during the peak of the price of cryptocurrencies. Again just like any other investment, thorough research and studies are needed to minimize the risk of losing your investments quickly.
If there is a formula to being rich quickly, then I guess everyone would be rich by now. The only formula is to work hard and to work SMART!