We'd need the internal data from companies to know for sure (good luck obtaining that) but it could be that it's no longer an effective tool for long term engagement and making money.

I know a lot more games are doing a 'pity' system where they have rng (though non payed in my examples) and have a way to get the things in game anyway over time if rng is not in your favour. Maybe people are tired of the random nature nowadays?