What's a crypto scam everybody should be warned against?

Crypto is booming, everyone wants to jump on the bandwagon, but most know little to nothing about the field, they just try and make some quick buck now and maybe become financially independent in 5 to 10 years.

And what happens when something goes so big? Wild scammers appear.

And I mean it in the broadest sense of the term: from those asking for your credentials for some "huge airdrop" that is starting "very soon" to people trying to sell you their coin that "will be going big by the end of the year, I promise!" when both they and their grandma know it's never going to happen.

No matter how weird and unconvincing their "once-in-a-lifetime opportunity" sounds, you always have people falling for it, because they're too naive, or desperate, or both.

What's the biggest scam (or kind of scam) are you seeing right now?

What's the biggest danger you'd like to warn the community against?