From day 1 sats. While popularity of OQ ranked itself can change from day 1 (but most likely it changes down due to people who only complete placements), the popularity of other mods is likely to be more or less the same. We know from Jeff OQ ranked is less popular than Workshop and Mystery heroes (7 and 4 place). So yea, it is around there. 10th is obvious exaggeration cuz there was only 9 mods showed. On day 1 popularity varied from 5.9% to 14.2 outside of Korea. And as I said, it should be more popular at first days.
is a post I refferring to.