The termination of the ADR facility could lead to a negative short-term impact on Nano Labs' stock price as it may cause uncertainty among investors and could potentially reduce the liquidity and accessibility of the company's shares for U.S. investors. The announcement is highly relevant and important to current ADR holders as it directly affects their holdings. The confidence level is not at the maximum because market reactions can be unpredictable and may also depend on broader market conditions and investor sentiment.