Even manually typing reddit.com/r/all (or r/All, which was a workaround for a while) in the address bar on iOS Safari redirects you to reddit.com/. Since I'm guessing you're not browsing reddit.com, what client are you using?

https://www.theverge.com/tech/906314/reddit-r-all-deprecatin...

it's dead, per official comment from reddit.

You probably use old.reddit and a legacy app, right?

> I exclusively view r/all...

You and I are very different Reddit users. I don't think I've even seen r/all for at least a decade. I exclusively view Reddit via the old.reddit.com URL in desktop mode with the Reddit Enhancement Suite add-on + uBO + a custom CSS theme. I'm automatically redirected to my 'Subscribed' page showing only the dozen or so niche subreddits I care about, none of which have more than 100k subscribers (most are under 25k). It's glorious... like a time machine to before Reddit enshittified itself and spammers, astro-turfers, shills and influencers took over.