when adding attributes to the SpatiaLite Writer, FME converts them to lowercase. However, sometimes output needs to be in camelCase. This was logged at Safe Software with track number FMEENGINE-60521. Hopefully this idea will get the attention it needs to become a higher priority.
SQLite and GeoPackage (which is in fact a SQLite implementation) do not have this behaviour in FME.
See also: https://community.safe.com/s/question/0D54Q00008gn7IDSAY/camelcase-in-spatialite