I'm working on a Rust API wrapper around the existing common API to make it easier to use. Implemented the calls that could let someone do this exact thing at scale last night.
It's nowhere near ready for production and is still missing a lot of basic API functionality even for a simple bot, but I think it'll be ready to publicly release in an alpha state within the next couple days.
When I used the official Reddit app before I saw the light of RIF, I had push notifications. I didn't have them on RIF except when I opened it, and I found that to be a lot nicer on my psyche.
I have email notifications enabled on Lemmy right now, which turns into a push. But I don't really mind as much because the conversations here are nicer, and it's usually replies to me trying to be helpful, which are nice to see.