Binance’s grip on global crypto trading is weakening as rivals pick up market share and traders shift to new ways of buying and selling digital assets.The world’s largest digital asset exchange’s percentage of overall spot trading fell to 25% in December to its lowest level of that market share since January 2021, according to CoinDesk Data. It was 28.5% in November. At its peak in 2023, the platform handled close to 60% of all spot crypto trades where actual ownership of the assets changes hand...