I think its a multiple set of factors/issues coming into play with the transfer portal certainly playing a role.
The IVY pretty much across the board has lost players who transferred, decommitted previously or decided to go in a different direction. I think this has helped open up additional roster spots and $$$ for aid that probably wouldn't have been there in a normal year. The IVY has always recruited decently but I can't recall a year like this where seemingly the entire league is recruiting at or near the upper echelon. Some of that has already slowed ie Brown and others but still its clear to me at least that there's definitely some additional juice/sense of urgency that hasn't been there previously.
I think players and there parents also realize there is backlog of talent at some of these schools and that they don't' necessarily believe some of these recruiting pitches when all American starters are only Sophomores and there is a 5 star coming in this fall at the same position. Duke and UVA and to a slightly lesser extent UNC fit this mold to a T. You can only bring in so many highly rated guys every year until someone actually reads a roster and says maybe I will go play and start at Princeton versus sitting for 3 years or moving to midfield at Duke or UVA.
You wonder if the NIL and the chance for exposure is helping those within the p5 ranks or at least those with a long history of lax play. SU has obviously had massive success so far this recruiting season while a team like Rutgers and a few others have struggled at least to date to land major players. Is that because certain teams have dabbled heavily in the portal, tough to say. Marylands off to a bit of a slow start for them but they usually hit the portal pretty hard and it hasn't been an issue, so I am not sure that argument holds at least for them. Could also be that were only 3 Weeks + in and some teams are taking a much more conservative approach and want a smaller class. Still fascinating to see the IVY and others start out hot while others coming off great season like Rutty and Loyola are struggling.