Digimon are Digital Monsters that live in a Digital world.
Appmon are AI's living inside of applications.
Digimon is a franchise in the Appmon real world but similarly to ours it never maintained it's mainstream success.
That's really all there is to say. Haru is a terrible tamer.
I found Brave heart super out of place in this episode, Doesn't fit into Appmon at all. They should've gone with Be my light instead of trying to please those who only watch this episode specifically because of Agumon.