I know merit sources are being given merits to circulate around the forum, but that doesn't mean they should not be called "generous merit givers" if they actually are, if we take the meaning of he generous in this context to be: "willing to give", thus this merit sources that make/top the list of generous merit givers can be said to be MS that set their standards to be more accomodating to other forum users and hence they give more merits than others (that does not in anyway imply they lower their standard), they can also be said to be MS that make out time out of their busy schedule to give out merits on the forum, or they can also be said to be users who are willing to rummage around quite a lot of shitposts on the forum to give out merits to good posts, etc, etc, that definitely makes them generous, imo, it doesn't matter how they get the merits, they could get it that same way and sit back, relax, and distribute it how they like, but for the ones who top this list, they are definitely putting in efforts that makes the generous, or put in another way, more generous than others.

Having said that, I'd actually not call merit source duties as their/a job, I think it's much better to say it's their own contributions to the forum.