I think this is true for any investment. You should only invest in an asset after you have done thorough research instead of following someone else blindly.
This is actually true, if we go ahead and be back to 2016-2017 era. Many investors were investing due to the influence of the others and not basically they've done their own research. It's important to know what you are investing and what you'd be doing with your money because you are responsible for what you do and not the other people. It sucks when you have invested to something or any crypto tokens or what not and then your main reason because a friend of yours told you to, or you've read a shill told you to do that, you're doing it the wrong way.
After all, it is your money that you're investing so if you suffer a loss, it will be your loss and not the person whose advice you followed. That said, I have invested in a crypto fund that has done well to diversify my portfolio so that I have high performing altcoins alongside bitcoin and can enjoy maximum profits.
They have to realize this that we're all responsible for any results that we do with our money. If fortunately, the random investment that you do and you've just followed the herd and you became profitable, that's good. But I'd tell you that it only happens rarely and this is not going to happen at most times, so it is best to rely on your research, your knowledge. It doesn't have to be in depth, but you should have an idea on what you're doing and spent a couple of times trying to know the basics of it.