PeridotGX
Smash Hero
I would completely get FF7 remake being bigger than Mario Maker 2. I'm talking about the Switch port of the original, which is a good .5 GB more.It's most likely since they're using the PS4 version of Final Fantasy VII, and that Super Mario Maker 2 is all 2D sprite work, where as FFVII is high-res 3D.
Granted, other studios have 3D and got it in a WAY smaller file size, but this is Square we're taking about.