[Curmudgeon]

I can't answer for Fantasy, but in real life (or more accurately in Irish folktales and myth), a satire whether by a bard or by a druid, followed you around. It made you a source of ridicule among other warriors, among the nobles and royalty. It could drive you to suicide.

Usually breaking the satire required a notable deed at odds with the satire. For example an act of great generosity to end a satire about your stinginess, or a great feast to break a satire about your poor guesting.

I would suspect that these Bardic curses inflict a reputation as well as mental stunning and it is this reputational penalty that is being referred to in the Extended Duration (Permanent).

Incidentally, there were lesser satires, that were effective at the moment but didn't linger on the victim but powerful bards could inflict permanent ones almost at will. The other aspect from folklore is that these satires were sometimes threatened by groups, such as Queen Maeve's bards, and also that heroes were sometimes blackmailed by these groups into taking certain actions "or we will make a satire about you."