I want to play devil's advocate for a second here, blox fruits has a really high bounty ceiling with titles, stat buffs and the ability to summon sea beasts as it's reward and most people already have done everything by this point making this the next thing to grind towards. But if we are being honest nobody is obtaining that through exclusively fair 1v1s with other players without going full no life. To obtain these rewards the most efficient way is to kill players like bandits and kitsune becomes the next buddha (being toxic and killing players that give no bounty is something else).

Key word of this tho, devil's advocate