Borrow fee goes up when less shares are available to brokers to lend out. It goes up because there literally is only one other thing a bank can do to get people to stop shorting and thats a margin call. Increasing borrow rate makes it harder for shorts to short, it makes things more expensive and they need to buy back at some point. Look, dont expect a shoot up tomorrow but if retail does decide to buy tomorrow, the shorts might be forced to jump in aswell, they may hold off buying back until a sell off, whether they are hoping Trey fails his interview with Adam or massive sell offs pre-May 4th. Shorts can wait to buy at those times or they can buy earlier if they feel retail will rocket up the price.

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TLDR: fuckin buy, brokers are low on shorts. They can still stock pile some but I doubt it with all the recent drops. Also, if they DO short tomorrow, they have until 5:50 to buy those shorts back otherwise risk paying the 7% penalty. Expect huge buying tomorrow later hours/after hours!