I'm all in for this theory though.
I was rolling gacha at least once or twice a month - always got either salt or golds, not a single rainbow for... half a year, maybe even more. I got salty and stopped rolling for a few months, saved up a bunch of gems, and suddenly - one rainbow after another.
After spending a bit on Radiant Cattleya and this event's gacha, I can say it seems my luck is going back to normal levels.
But that's just a theory. A gacha theory.