I imagine it would be no different than current indexing strategies with a temporal aspect baked in... it would act almost like a different site, and maybe roll up the results after the fact by domain
If it was a commercial problem, e.g. from Google, it would be solved.
The reality is that many things don't exist simply because someone isn't paid to do it.
How much AI companies have benefited by leeching off of IA and Common Crawl, it's a shame there's no at least some money flowing back in.