I could not agree more.
Meaningful from a legacy doesn’t necessarily have to be gigantic. Unis like to see legacy support over a long period of time, with regular contributions. I have seen legacy disappointments from those who gave virtually nothing since graduation, then all of a sudden cut a $5k cheque 3 months before application. From what I have seen and heard from admin and those leading alumni associations, a long-term record of 4 digit contributions can be very well regarded by some elite Unis.
I am talking about “boosting” one’s odds. If one wants really high odds, @gardenstategal may be right about what meaningful is. It’s called “pulling a Kushner”.