According to @BitMEXResearch, four rounds of spam attacks on the Bitcoin network in 2015 significantly disrupted user experience, particularly during the third attack from July 7 to July 11, 2015. The increased on-chain congestion led to delayed transactions and higher fees, directly affecting traders and payment processors who relied on timely confirmations. These disruptions underscored the importance of scaling solutions for Bitcoin and highlighted transaction fee volatility as a crucial factor for crypto trading strategies at the time (Source: BitMEX Research blog).

According to Vitalik Buterin, new proposals aim to significantly upgrade DA bandwidth, allowing for more efficient and faster transactions on the Ethereum network. This could potentially enhance trading operations by reducing transaction times and costs. As per Vitalik's statements, the proposals focus on scaling solutions that improve data availability, which is crucial for decentralized applications and smart contracts that traders rely on for executing trades efficiently. (Source: Vitalik Buterin's Twitter)