Privacy invasion feels like Nii-kun wouldn't care (not like he hides his sayings/personalities/feel like i'd be more annoyed by going on that "date" with MC's childhood friend/stalker of his) versus "Ok i'll charge you and everyone in your family /sign you up for a buddhist name/funeral arrangements"
(tho surprised someone like Nii-kun is working here, comedy aside feels like he's capable of making more if not his 'band' being popular and all that too lol)
I should have posted this a few chapters ago... but I didn't really expect the story to go meta - not that I dislike it, more of a funny surprise and I quite like it, especially if we get to see more Nii antics.