My son got on the WUSTL waitlist, did what was asked and eventually got a letter (maybe in July) that he wasn’t chosen. This was 2019.
My daughter was offered WL by Emory (went on) and W&M (declined her spot). She did not get off Emory. This was 2021.
I think the schools do a good job of letting you know - sign up - but look elsewhere (in a nice way) - and I think that’s good advice.