"The short interest staying at a similar range means nobody has closed out their old positions so we can keep squeezing" seems to be a big one.

If you assume that new short positions are being opened - and at the recent prices, that's not an entirely unattractive thing to do - then the short interest staying steady suggests some positions being closed and others being opened, and tells you little about single actors.

And anyone opening short positions at today's prices is basically "resetting the clock" on how long you'd need to squeeze to get them to back down... so if I were to sell it short now, I'd be betting that some folks making some of their first investments ever to ride the hype train are going to be more likely to blink first than I am.