[plamzi]

Because in my observations it is what most players (being teenage boys) expect to get. To be clear, they expect some form of PvP and they expect it to be available easily to them as soon as they master the basic controls. The only way to deliver that, for us devs, is to implement some form of compulsory PvP, or else the newbies who are eager to fight may not find opponents, and the momentum is lost.

I should add that in my observations, a tactic that is hugely successful in mobile games is enabling online players to fight offline ones. Of course, there's protection from being attacked more than once in a row. I think this feature belongs to a separate list: what devs can implement in a 21st century MUD to improve momentum and viral presence.