SF apartment listings disappear within hours but Craigslist and Zillow show stale listings for days

A good 1BR under $3,000 in SF gets 50+ inquiries within 4 hours of posting. By the time Zillow syndicates the listing from the property manager's website (24-48 hour delay), the unit already has 20 applications. Craigslist listings are manually posted and often left up for days after the unit is taken because landlords forget to delete them. You spend 30 minutes writing a personalized inquiry for a listing that was rented 2 days ago. So what? The entire SF rental search process is built on stale data. Renters waste 10-15 hours per week responding to listings that are already gone. They schedule viewings for apartments that are already taken. They tailor cover letters explaining why they are a great tenant for a unit that has a signed lease. The time-to-lease for a desirable SF apartment is 24-72 hours, but every major listing platform operates on a 48-72 hour refresh cycle. The search tools are slower than the market. Why does this persist in the first place? Listing platforms (Zillow, Apartments.com) aggregate from property management software (AppFolio, Buildium) via daily batch syncs, not real-time feeds. Craigslist is manually posted with no integration to any leasing system. Small landlords (who own 60%+ of SF units) have no leasing software at all — they post on Craigslist, collect applications via email, and never update the listing status. There is no MLS equivalent for rentals that would provide real-time availability across all listings.