Bitcoin ETF approval rumors increase liquidity by drawing institutional investors who view ETFs as a regulated entry point into crypto. Higher trading volumes and open interest in Bitcoin futures, as seen post-rumors, reflect this trend. However, institutions often remain cautious, awaiting official confirmation. Investor strategies include accumulating Bitcoin during dips, expecting long-term price appreciation, or using ETF-related derivatives to gain exposure without direct crypto ownership. Retail investors, driven by FOMO, may over-leverage, risking losses if rumors fizzle out.