I suppose, but really what you need to achieve that is not the app-developers modifying their apps, what you need is some bridge that exposes a reddit API on to

I suppose, but really what you need to achieve that is not the app-developers modifying their apps, what you need is some bridge that exposes a reddit API on top of lemmy (or the fediverse in general). In theory anyone could build and run such a bridge, but I'm not sure if anyone has a strong incentive to make one.