I thought there was some anti-trust ruling in the last couple years that schools could no longer arbitrarily treat May 1 as a final commit date or maybe it was that schools could keep competing after this date to flip students. How does this work exactly?

Applying to College
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Now with the transfer portal, this rule is being avoided. Also, the student could go to a non-NLI school (Div 3, NAIA, Ivy, JUCO). I still don’t think it is common.