Both of my sons pulled or didn’t complete apps after getting into some of their top choices EA. They were both in selective admit HS programs where most of the students were applying to the same limited list (as in 35% of the class to MIT EA at one school and 28% to Yale at the other).
They both kept a couple apps in play for merit/FA purposes, but decided not to collect acceptance letters for the heck of it. Their lists were only schools where they wanted to be academically and knew they would be happy.
One applied to two Ivies, purposely didn’t send in everything for one of them (I found out months later), and the other had decided Ivies were too reachy and focused on the next tier.