According to Eric Balchunas, some platforms do not openly disclose their full Bitcoin transaction fees, instead showing only the amount of bitcoin you receive. Upon calculation, users may discover that the real fee is over 2%, which can significantly impact trading profitability and portfolio performance (Source: Eric Balchunas on Twitter, May 16, 2025). Crypto traders should always verify the effective fee rates using independent calculators before executing trades to avoid unexpected costs and optimize trading strategies.