Been looking back at some wild crypto history from a few years ago and honestly the scale of rugpull scams still blows my mind. Back in 2021, investors got absolutely wrecked by what the industry calls rugpulls - basically when project creators just vanish with all the liquidity. We're talking $2.8 billion gone that year alone, which was crazy considering it was only 1% of scam losses the year before.

The mechanics are actually pretty straightforward once you understand them. Developers launch what looks like a legit DeFi project, get people hyped on social media, launch a token, list it on a DEX. Looks good, right? But here's the thing - they never lock their liquidity. So once the pools fill up with millions in actual value, they just pull everything out and disappear. The whole operation might only run for a few hours or days before the rug gets pulled.

What really stuck with me is how brazen some of these got. There was this Twitter account called WarOnRugs that built up like 100k followers by exposing rugpull projects. They raised $2 million to fight the problem. Then they just... pulled the rug themselves. The irony was almost impressive.

The most notorious one was Thodex, a Turkish exchange where the founders literally vanished with over $2 billion in client funds back in April 2021. But most of the other major rugpulls were DeFi projects with names ranging from actually funny to completely absurd - Meerkat Finance, Evolved Apes, Polybutterfly. AnubisDAO hit people for $58 million, another one on a smart chain network took $50 million.

What's important to understand is that rugpulls are different from regular hacks or fake giveaway scams. It's a specific attack vector that only works because developers maintain control over liquidity pools. If they actually locked the liquidity by burning the private key, the whole thing becomes technically impossible. But that's the tell-tale sign something might be sketchy - when a project refuses to lock liquidity, that's a massive red flag.

The whole situation back then really highlighted how fast DeFi was moving without proper safeguards. Supply liquidity to a project on a DEX and you're trusting developers not to be criminals. Sometimes that trust got brutally broken. Definitely a lesson in doing your own research before throwing money at new projects.