Web extensions are extremely limited by Apple. That is why we don’t have uBlock origin. A PWA alone would not get the job done. This isn’t talking to an API. You would have to parse out the HTML and reformat it, intercepting links, etc. View the source of new reddit and you will see what I mean.
You also can’t design around old reddit because they are killing that next.
Likely not possible on iOS. Apple has too many restrictions. It works with lemmy because lemmy has a free API and doesn’t attempt to obscure it’s code. New reddit employs a ton of stuff to try and stop these types of efforts. Apple has a ton of restrictions surrounding code execution and browsers (all browsers have to use safari’s engine). That being said, I am not an iOS developer (outside of cross platform tooling), so it might be possible, but from what little I know of Apple’s policies, not likely.
That being said, I am thinking about the idea of a reddit proxy addon for lemmy, something that would expose r/* communities to lemmy via an API. This would primarily be of use for developers, but could potentially allow r/* communities to exist alongside lemmy communities, with the caveat that reddit users would not see comments. The proxy would actually scrape reddit for posts/comments, cache them in redis, and offer the cache up via a restful API, so it wouldn’t be realtime, but it would be a starting point.
I visit the Ukraine livethread on worldnews once a day and that is it. I use Lemmy or Mastodon mostly.
I am not logged into my reddit account, and ads are blocked. I use a VPN. I cancelled my reddit premium subscription when the API changes were announced.