Here are some notorious scam decentralized exchanges (DEXs) and wallets:

1. *Ethersmart*: A fake wallet that stole users' private keys.

2. *Coinix*: A scam DEX that disappeared with users' funds.

3. *IDAX*: A Malta-based exchange that exit-scammed with users' assets.

4. *PlusToken*: A Ponzi scheme disguised as a DEX, defrauding users of over $2 billion.

5. *Cloud Token*: A scam wallet that promised unsustainable returns.

6. *BitGrail*: An Italian exchange that suffered a mysterious hack, losing users' funds.

7. *Coinexchange*: A DEX that shut down suddenly, leaving users with significant losses.

8. *Fcoin*: A Chinese exchange that exit-scammed with users' funds.

9. *Giza*: A scam DEX that promised unrealistic returns.

10. *BitPetite*: A Ponzi scheme disguised as a DEX, defrauding users of their funds.

Remember, always research and thoroughly vet any DEX or wallet before using them. Be cautious of unrealistic promises, poor reputation, and lack of transparency. Stay safe!