Yikes!  The linked article suggests the looming increase in endowment tax is the culprit, since Princeton would pay the highest rate:

[The House bill] still uses the same $500,00 per-student threshold for the original 1.4 percent endowment tax, which was passed during the first Trump administration in 2017. From there the tax rate increases in tandem with the endowment per-student ratio. Institutions with endowments of $750,000 to $1.25 million per student would be hit with a 7 percent tax. That rate would climb to 14 percent for colleges with endowments valued at $1.25 to $2 million per student, while colleges with endowments of $2 million or more per student would pay 21 percent.

A subtler change, which was not identified in the draft bill, says that international students can no longer be included in the enrollment tally. That means that a few institutions that have large endowments but also high head counts made up largely of international students, like Columbia University, will now be subject to the tax

It's not just Columbia that will be affected, since many elite research universities enroll 20% or more international students.  (I suspect UChicago will end up in a higher bracket if international students are excluded in the per-student calculation.)