Most other private universities could have easily managed the relationship, but a mix of inertia and vindictiveness from certain alumni (eg. Ackman) messed it up.
Mind you, Dartmouth is also kind of unique in that their alumni relations team actually TRY to maintain a relationship. The other high prestige colleges (excluding USC) ignore you until they need to hit fundraising KPIs.
A Tuck or Dartmouth College grad will always fight for an alum if they make it to the shortlist - most other Ivy grads don't (Wharton kinda, but that's only for Wharton). This really helps build loyalty.
[0] - https://www.politico.com/news/2025/03/19/trump-is-bombarding...
Yale and Dartmouth are similar in student body size, yet Yale has been hit by investigations [0] while Dartmouth has been spared.
[0] - https://www.ed.gov/about/news/press-release/office-civil-rig...