The first smart contract blockchain, Ethereum, was monolithic by design, meaning it manages its own execution, settlement, consensus, and data availability. Over the years, new decentralized applications developed, leading to increased demand for blockspace. When the demand for blockspace is more than its supply.

Ethereum's like the OG of smart contracts, man! 💥 It's been holding it down since day one, handling everything from execution to consensus like a boss. But yo, with all these dope decentralized apps popping up, it's no wonder the demand for blockspace's skyrocketing! It's like the hottest ticket in town! 🔥🚀