Have you used one of these apps before? They capture a lot more than emergency stops, what I would classify as the above normal brake effort but not hard braking. Im sure the data exist to set the cutoff but its a lot more than “jam your foot on the pedal braking”.
It’s still out of the norm braking for my style of driver but from what I see on the road, people drive aggressively like this. Especially in the US.
If you don't want to go through your insurance company you can check out an app we built called RoadClub. You get points for safe driving behavior - and you can get the hard brake alerts. Is it a bit annoying? yes. You can't just drive agressively - you need to give space to slow down. I still struggle with it.
It’s still out of the norm braking for my style of driver but from what I see on the road, people drive aggressively like this. Especially in the US.