A developer/moderator(?) for Reddit stated, at the time that they removed the option to disable the Reddit app popups, that it was to consolidate settings, and various other non-committal statements.
They tried to heavily imply the setting was returning elsewhere, without a single promise.
I really should dig back into that conversation..
@epidiah
Ah I was slightly mistaken but here we go:
https://www.reddit.com/r/redditmobile/comments/y3f08p/comment/isaz5h8/?utm_source=share&utm_medium=web2x&context=3