What cryptocurrency has disappointed you the most since you've been in the crypto world?

Almost thirteen years after the official launch of the Bitcoin network, the digital currency invented by Satoshi Nakamoto remains the undisputed leader of the crypto world. The compass that gives direction to the market as a whole.

Since you've entered the crypto world, you've probably become interested in other cryptocurrency projects.

With each project proclaiming loudly that it will revolutionize the industry by eventually surpassing Bitcoin (or Ethereum), you must have had high hopes for some cryptocurrencies. Those hopes may still be there, or they may have faded away, caught up with reality.

My question is more about those cryptocurrency projects that you believed in so much, and that have totally disappointed you in the end. Do not hesitate to tell me what justifies this disappointment. These can of course not be final, you never know.