I've been reflecting on how much the crypto market has changed over the past 5 years. From 2021 to 2025, we've seen a wave of projects that seemed promising but ultimately turned out to be complete disappointments. I wonder: how many failed cryptocurrencies have we actually seen collapse during this period?

The answer is: more than we might imagine. When FOMO was at its peak in 2021, with low interest rates and the NFT and DeFi mania, thousands of tokens were launched into the market. Some had market caps of billions of dollars within a few months. Then came the correction, and everything changed. Projects promising the sky dissolved, leaving behind only frustrated investors and painful lessons.

To understand what truly makes a coin dead, it’s not enough to see its price drop. A dead coin is when it gets delisted from major exchanges, when the team disappears from social media, when the code on GitHub is no longer updated, and when trading volume plummets to nearly zero. It’s the combination of these factors that tells you: this project is finished.

The cases everyone remembers are emblematic. Squid Game Token (SQUID) was the classic example of hype without fundamentals. Late 2021, linked to the Netflix series, with promises of play-to-earn, valuation soaring over $2,800. Then the developers executed a rug pull, selling everything and leaving the tokens essentially worthless. Disappeared. Ruined investors. It happened so quickly that it remains one of the most emblematic cases of failed cryptocurrencies to this day.

But when it comes to true systemic disasters, Terra and its stablecoin UST remain the benchmark. LUNA was a well-known crypto, and UST was designed as an algorithmic stablecoin with a mint-and-burn mechanism. On paper, it looked elegant. In practice, it was a disaster. When large holders started withdrawing, the peg broke. Attempts to save it—(swap billions in USDT, Bitcoin sales from reserves)—only delayed the inevitable. Once the system broke, UST holders began burning tokens to mint massive amounts of LUNA, triggering hyperinflation that wiped out the value of both. A billion dollars evaporated. Thousands of people ruined.

So why do these disasters happen? The reasons are always the same, repeated endlessly. First: rug pulls and outright Ponzi schemes. Teams raising millions, promising the world, then disappearing. Or worse, creating Ponzi systems where new investors pay old ones until the whole castle collapses.

Second: teams that abandon projects after raising funds. Once the money is collected, the team disappears. No development, no updates, no support. The token loses all purpose. This happens more often than you think, even with teams that initially seemed serious.

Third: disastrous tokenomics. Releasing too many tokens too quickly creates inflation that erodes value before the project even takes off. Or tokens with no real utility, no reason for anyone to want them. Sustainable tokenomics require balance, clear utility, and smart incentives. Many projects don’t even understand this.

Fourth: external factors. A major hack can drain liquidity and destroy trust. Sudden regulatory crackdowns force exchanges to delist tokens. Large-scale market crashes, like in 2018 or 2022, wipe out weak projects. Even legitimate projects can’t survive sufficiently strong external pressures.

Fifth: no community, no communication. If the team doesn’t talk to investors, doesn’t respond to concerns, doesn’t meet promised milestones, trust collapses. The community disappears, liquidity dries up, delisting becomes inevitable.

Looking ahead, I think the market is learning. With clearer regulation and more informed investors, survival rates should improve. Scams will be filtered out, and informed investors will avoid projects driven purely by hype. This means failed cryptocurrencies could become less common, but also that surviving projects will need to be built on solid foundations: real utility, active development, strong community, and transparency.

The future will likely be a smaller but healthier market, where credible initiatives thrive instead of thousands of tokens built on nothing. And honestly, for those who truly believe in crypto innovation, this is a good thing.