You:
Also you, before you conveniently edited your post, as you can see in my quote:
You are so close, that you are only off by a factor of 100 and Android doesn't even exist apparently, but I'll even grant you the 0.1% figure.
Reddit has approximately 52-55 mil daily active users. Now if you'd say that mostly everyone who downloads an app is also usually actively using it on their phone, minus a certain percentage of dead/unused phones obviously, and if you acknowledge that Android exists, then even your edited 0.1% is nowhere near realistic.
I can't check the iOS store, but Android alone has the following apps:
• RiF ~ 5m+ downloads
• Boost for reddit ~ 1m+ downloads
• Sync for reddit ~ 1m+ downloads
• BaconReader for reddit ~ 1m+ downloads
• Relay for reddit ~ 1m+ downloads
• Now for reddit ~ 500k+ downloads
And at least 5 smaller apps with 100k+ downloads each, so another 500k+.
In conclusion Android alone has 10+ million third party downloads and I highly doubt, that Apollo is the only alternative on iOS.