There can’t be a gig of content in this game… unless the packager is including all the unused starter content!
Yep, it is including every asset you have in your project.
It is your responsibility to clear every unused file before packaging (in a real game).
this is why, whenever using stuff like start content, move whatever images you use to its own subdirectory within content, then once your done u can safely delete starter content and save a lot of space (its like 600mb)