YouTube Description: Ethereum's December 2025 Fusaka upgrade was supposed to cut fees and drive L1 adoption. Instead, it collapsed fee revenue by ~90%, unleashed a wave of address poisoning attacks, and triggered a crisis in validator economics — while Vitalik Buterin started quietly selling his ETH. Meanwhile, Cardano just crossed $1.1B in TVL, launched LayerZero interoperability, and hit 1M+ TPS in stress tests. This is not your usual ETH vs. ADA debate. This is a technical, economic, and strategic deep-dive into what's really happening to both chains right now — and what it means for YOUR portfolio.
Sources: Culper Research Report (March 5, 2026) · Coin Bureau · CoinDesk · Ethereum.org · DeFiLlama · Disruption Banking · CMC · Messari · Arkham Intelligence · Fidelity Digital Assets
