How this game even works?

hey, can someone explain. why did I got so little exp, compared to this guy? I mean yeah, I performed poor in this battle, but c'mone, I didn't even got Battle Pass points wtf.

https://preview.redd.it/od24zachkbhh1.png?width=1544&format=png&auto=webp&s=ec24bf9fa67fecdda00d1b7b65f254032d012c22

https://preview.redd.it/cn3j3zcikbhh1.png?width=1552&format=png&auto=webp&s=5484f1aa819a6b8facb8e3436aa5c7d913d36ee3

https://preview.redd.it/916fahvvlbhh1.png?width=1513&format=png&auto=webp&s=e40506041ad02a2b2e0501425ee9b284d6fd6819

https://preview.redd.it/a0si7oo7mbhh1.png?width=1515&format=png&auto=webp&s=32714ad86bf4a11330503769bd36e64a365f1c21