Actually no, elemental pick-ups started at 3x and were changed to 4x on 9th June 2018 (yes, they were the same in time of pick-up we have now).
New characters gacha in nutaku heavily lagged behind, but they also catched-up to DMMs at the same point of time (which was 20x after 7th November 2017, changed to 25x on 5th October 2018). The problem with this one though is, that nutaku has weighted down rate-up for jewels (probably only for new characters, no mention that 3x on elemental up is only for star coins).
All info taken from JP wiki.