I seriously doubt ALL Ed acceptances are hooked…plenty of kids apply ED/EA regardless…
https://www.instagram.com/deerfieldcolleges2023/
https://www.instagram.com/taftcolleges2023/
https://www.instagram.com/proctordecisions2023/
https://www.instagram.com/peddie2023collegedecisions/
some of these say or imply if kids are committed to a sport; and if you are super into such things some schools have on official page photos of kids who are committed, etc. No way of knowing about development/legacy status, etc.
(Ps these are just random schools I found quickly) and obviously kids have to chose to submit, so not everyone is included.