Just going off of a quick stroll through the iOS app store (as of time of this post)
Apollo is the highest rated 3rd party reddit app at #11 in the News category (for comparison, the next highest was Narwhal at #75 within this same category)
Apollo does not however breach the top 200 apps app-store-wide. The official reddit app does at #52 overall. and enjoys the company of other ubiquitous apps like Hulu, Duolingo, Google Drive, and Disney+, all within 10 ranks of it on the overall list.
It does seem that reddit has crunched their numbers and gambled that 3rd party app users and the uproar they are in is a calculable loss against the groundswell of desktop and official reddit app users.