The ProShares UltraShort Bitcoin exchange-traded fund (SBIT) experienced a surge in inflow on Monday, with $18.8 million added, which is the highest daily inflow since its launch in April. This increase suggests that investors believe the recent Bitcoin rally, driven by Donald Trump's election, may be overextended.

In addition, the ProShares Short Bitcoin ETF (BITI) has also attracted significant interest, with approximately $23 million added over the past two trading sessions, making it one of the highest inflow periods this year. These movements indicate a strategic shift as investors aim to profit from potential downturns in the cryptocurrency market.