According to Cas Abbé, the May 2025 Altseason lasted just three weeks, despite significant events such as a US-China trade resolution, increased M2 money supply growth, Bitcoin reaching a new all-time high (ATH), and a peak in BTC dominance. Abbé notes that while these bullish macro and crypto-specific catalysts occurred, the Others/BTC trading pair hit a new cycle low, signaling persistent weakness in altcoins. Abbé emphasizes that until Bitcoin consolidates above its ATH, traders should not expect a sustainable Altseason, highlighting the importance of BTC price action and dominance for altcoin market timing (Source: Cas Abbé on Twitter, May 31, 2025).