I'm sure telling you about how risky crypto and the crypto space is, would not be news as we've seen so many instances and examples in recent times.
At this point, I think the most important thing to know is how to ensure that you don't fall for these schemes, especially with projects you want to invest in or the exchanges.
For example if I'm looking to choose an exchange right now, I'd be looking for information that points towards safety. For example, the article that talked about Bitget userbase increasing by 400% in 2024 shows that a lot of people trust the exchange and that can't be a coincidence.
You can also check track records, quality of service etc, and this can help you make a decision. Of course this is not all to look out for, and I'd appreciate more examples regarding this.
Pointing at exchanges, the quantity of users doesn't determine the trust percentage of these exchanges. In most top exchanges I know about, users also scam themselves too. Everything you just have to know is how to be vigilant and understand the principle of not falling into these scams by not sharing what is private.
I don't know if you've heard of P2P scams.. they all happen in exchanges. So the quantity of users in an exchange can even create room for scammers.
Looking at projects.... You just have to make research (DYOR) and don't get carried away by the speech of the project team especially when it comes to presales.