Re/ not hotlinking the images: Not gonna happen :) I'm not going to balloon the size of the repo, or add the overhead of a database, just so I can locally serve those images. I'd rather take them out entirely at that point.

Re/ linking back to the source: Great idea! I look forward to your PR. Start with https://github.com/hiAndrewQuinn/selkouutiset-scrape/ and see if you can figure out the logic behind how YLE.fi chooses its archive tags, maybe there's a pattern in there I was unable to see when I tried this myself.