1. Counterparty Risk (Trusting Middlemen)
Platforms like FTX, Celsius, Mt. Gox, and QuadrigaCX did not fail due to cryptographic flaws in
Bitcoin or cryptography. They failed because users handed their private keys back to centralized
custodians. These middlemen re-introduced the exact fractional-reserve banking practices, lack
of transparency, and insolvency risks that Bitcoin was built to replace.
2. Complexity Risk (Turing-Complete Fragility)
Smart contracts, bridges, and cross-chain platforms expand the attack surface exponentially. In a
Turing-complete environment, code is law, and if the code contains a single bug, it will
eventually be exploited (e.g., The DAO, Wormhole). These are not protocol-level vulnerabilities
of simple systems, but structural fragilities of complex ones.