The hope for sustainable institutional adoption through spot Bitcoin ETFs meets a harsh return of volatility. Praised in 2024 as vectors of stability, these products have just recorded over 680 million dollars in net outflows in the first week of 2026. This sudden decline, in a climate of monetary uncertainties and geopolitical tensions, calls into question the solidity of their anchorage in traditional finance and raises doubts about the market's ability to absorb shocks in the long term.