Don't think it would even be that hard to do, I mean... They could just make it so that, instead of getting 5 stones on the tutorial to spend on the REM, you could get a single pull from a beginner-exclusive Egg Machine.
Hell, if they're feeling particularly lazy, just give that REM a 100% of chances of giving you a random monster from the previous godfest (or whatever godfest might be on at the time) with lowered chances of Special Gods.
But of course, most gaming companies don't seem to use common sense, GungHo apparently is no different.