1 Gallery is an online feature
2 For online games, both, Xbox and Playstation require you subscribe to their premium service
3 It mean a 3rd party earning money with The Sims
4 The Sims is a single-player game, the only feature than need online is gallery, then I dunno players will subscribe to PSN or xbox gold just to use gallery
Then the only way to have gallery would be if EA agree with Sony and Microsoft an exception for point 2, so The Sims 4 could use online features for free
Do you know games than could agree such exceptions?