According to @business, a new rule aimed at curbing exposure to overvalued stocks via margin curbs is posing another challenge to China’s stock market and threatens the rally in market favorites (source: Bloomberg @business tweet and linked report on Oct 22, 2025). Bloomberg (@business) frames the measure as a headwind for high-valuation equities, signaling potential pressure on segments previously buoyed by leverage, although the post does not specify sectors or tickers (source: Bloomberg @business). Bloomberg (@business) does not cite any direct cryptocurrency impact in this post, so the source provides no explicit implications for BTC or ETH (source: Bloomberg @business).