According to @danheld, Bitcoin block space has been full of 'spam' since inception, and transaction fees act as the network’s spam filters (source: @danheld on X, Oct 8, 2025). For traders, this frames fee spikes as congestion signals; monitor sat/vByte fee rates and the mempool backlog when timing BTC deposits, withdrawals, and on-chain arbitrage (source: @danheld on X, Oct 8, 2025). Operationally, budget for higher on-chain costs during peak demand and target lower-fee windows to reduce slippage when moving BTC to and from exchanges (source: @danheld on X, Oct 8, 2025).