Trezor CEO Matej Zak has expressed concerns over Bitcoin ETFs and corporate treasuries, describing them as a 'double-edged sword.' While these financial instruments introduce significant new capital into the market, Zak argues they compromise the fundamental principle of direct Bitcoin ownership. He pointed out that spot Bitcoin ETFs currently manage over $155 billion in assets, and corporate entities like MicroStrategy hold approximately 1.043 million BTC, valued at $119 billion. Zak cautioned that these leveraged products could undermine Bitcoin's original vision as 'digital gold,' which is intended to empower users with full control over their assets.