If we're talking about the original idea of "you kill mob X, and your app tells you in an hour" then yes you have to be logged in and kill something for it to work. Maybe you don't have to be logged in after, but the same is true of a kitchen timer.
On the other hand, if we're talking about someone killing the mob you want to kill, then having their app tell the server "Mob X killed at 12:00", then yes in theory that app could alert you at 1:00 that "Mob X (or its placeholder) just spawned.
But in that scenario, odds are the guy who killed the mob the first time is going to want to kill it again when it respawns (and thus probably wouldn't even have his app tell the server). And even if he doesn't, that's ultimately the same thing as having a forum thread where people can post "I killed mob X at 12:00, but I'm not planning to kill it again when it respawns at 1:00".
So I guess we have to ban the forums now huh? Damn, despite the idiots on them I rather liked them ...
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