P2P makes sense, but truly decentralized exchanges are the best way to get tracked. Everything on the blockchain is traceable and stored forever. That is how they track criminals that use crypto. Blockchains are the perfect tool against money laundering and tax evasion.

The best way to be anonymous and avoid taxes on profits is to find the shadiest exchange, trade on it and hope they do a rug pull and delete all their servers so they leave no trace.